1.stranger 陌生人,  busy 忙碌的,  pardon 请再说一遍,原谅,  

biology 生物,  mean 表示……的意思,  not really 不完全是.  

2.礼貌用语：

Excuse me! Can I ask you some questions?

Yes, sure./Yes, no problem.

I’m …… what’s your name?

I’m ……….

Ok, Do you ………?

Yes, I think so./No, not really.

Nice to meet you!

Nice to meet you too!