1.talk about 谈论；讨论

It's not polite to point or talk about strangers in public.

在公共场合对陌生人指指点点或议论纷纷都不礼貌QZ51~76-)K.KU]6P^。

2.sign up 注册；报名

Maybe you and me should sign up.

也许你和我也可以去登记PC4,vpoG^L0。

3.for instance 比如；举例说

There are a number of improvements; for instance, both mouse buttons can now be used.

在许多地方有了改进，例如，鼠标的左右键都可以使用了i~tm~0s&5hx4!9=*。