You are what you eat

A: Taotao, long time no see.    （好久不见）

B: Long time no see, Yumei. You haven't changed a bit.   （你一点没变）

A: Neither have you. You look as slim as you were in high school. （你还是那样苗条）

B: You too. You look as thin as you were 10 years ago. （你也和高中时一样廋）

A: How did you do that? （你怎么做到的）

B: How did you do that? 

A and B: You are what you eat! Ha...ha...ha...  （食材决定身材）

long time no see    好久不见

a bit  一点

slim    苗条的

neither   也不

You are what you eat.    食材决定身材