walk by :走过,闲走
例如：
I go out of my way to walk by the building,listening for sounds,smelling the air for rot.
我在那座建筑物附近走来走去,听听动静,嗅嗅空气中有没有传来腐烂的气息.
bargain：讨价；讲价
She beat a bargain with a dealer.
她与贩子讨价还价.
In the US and Canada,there are not many places where you can bargain.
在美国和加拿大,买东西可以讲价钱的地方并不多.