18_Track_18
Jul 26, 2026 16:49
· 2:21
· English
· Whisper Turbo
· 2 Speaker
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Test 2.
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Listening.
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Section 4.
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Now listen and answer questions 35 to
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40.
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If its use in trousers was
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a major factor in establishing the zip as a fashion icon,
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despite its occasional tendency to trap parts of the wearer's anatomy,
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another major breakthrough came with the separable zip,
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the kind that opens at both ends.
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This type,
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still widely used in a range of items,
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from jackets to tents,
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is shown in the diagram.
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Let's look first at the right -hand side of the illustration,
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at the material attached to the item of clothing,
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the bag,
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or whatever.
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This is the tape,
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which is usually made of fairly tough fabric.
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At the end of that,
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there's what is known as the heat seal patch,
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the cotton and nylon laminated material used to reinforce the tape.
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Now,
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alongside the heat seal patch is a small piece of metal used
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only on a separating zip.
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whose function is to enable the two halves of the zip to join.
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This is known as the pin.
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Opposite that,
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on the other half of the zip in the diagram,
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is a device which correctly aligns the pin.
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The box,
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as it's called,
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begins the joining of the zip halves.
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Running up the inside edge of each half are dozens,
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possibly hundreds,
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of metal teeth,
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each of which has a small hook and an equally tiny hollow.
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Moving up and down the teeth to open and close the zip is a piece of metal
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called the slider.
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This is operated by means of a pull tab,
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so called,
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because logically enough,
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the wearer or user pulls it in one direction or the other.
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To close the zip,
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a wedge inside the slider pushes the hook of each tooth on one side
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into the hollow of each offset tooth on the other.
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To open it,
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the wedge forces them apart.
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To prevent the slider coming off the teeth at the other end,
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there is a top stop on both sides of the zip.
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This basic design has changed little in the many years since it
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was first introduced,
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although nowadays,
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of course, zips,
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zippers,
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are available in a whole range of shapes,
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sizes,
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and materials.
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That
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is the end of test two.
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