慢速英语:Research Grows Through Citizen Science; Vocal Trash Recycles More Than Old Songs; Artist Cre

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1. observe vt. 看到,注意到
例句：He observed a stranger hanging around the store.
他看到一个陌生人在商店附近闲逛。

2. demonstrate vt. 论证,证明
例句：The lawyer demonstrated that the witness was lying.
律师证明证人在说谎。

3. identification n. 认出;识别;鉴定;确认
例句：Certainly. Do you have any identification? 
当然可以。你有任何证明文件吗？ 

4. recycled vt. 使再循环;再利用
例句： We must recycle the cardboard boxes. 
我们必须循环使用纸盒子。

5. carve vt. 切开
例句：Please carve me another slice. 
请再给我切一片. 

6. attractive adj. 有吸引力的
例句：The offer is very attractive to us.
这一出价对我们具有很大吸引力。