語音 260515_191710

Luidsprekere

• Speaker 1 0:00
• Speaker 2 0:13

1. 0:00

   Hoofstuk 1: Hello, every professor. 106s · Speaker 1

   Hello, every professor. My name is Kai from China High School. Am I very devoted to change my thought into reality through experimenting or observation and actions? For example, I'm very interested in gemstones, especially Ruby. So I starte…