1.talk about 談論;討論
It's not polite to point or talk about strangers in public.
在公共場合對陌生人指指點點或議論紛紛都不禮貌
2.sign up 注冊;報名
Maybe you and me should sign up.
也許你和我也可以去登記
3.for instance 比如;舉例說
There are a number of improvements; for instance, both mouse buttons can now be used.
在許多地方有了改進,例如,鼠標的左右鍵都可以使用了