Active transport is carried out by protein carriers within the cell membrane, and they have a specific binding site for the exact molecules they are transporting.

主动运输是由细胞膜内的蛋白质载体进行的，它们对所运输的分子有特定的结合位点。

Over the years she realized different parts of the city seemed to have its own specific kind of junk and so her collages are now site specific.

多年来，她意识到城市的不同地区似乎都有自己特定类型的垃圾，所以她的拼贴画现在是特定于地点的。

My collages are always site specific so I will record this as my walk on Madison from my from 12 east 87th street to park avenue and 87th street.

我的拼贴画总是有特定的地点，所以我会把它记录下来，作为我在麦迪逊从东87街12号到公园大道和87街的漫步。