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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。
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。
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。
