*so² linking word 1 used when you are explaining that something made something else happen 因此，所以: I heard a noise so I got out of bed. 我听到一个声音，所以就下了床。 2 so (that) in order to make something happen, or to make something possible 为使，以便: I put your keys in the drawer so they wouldn't get lost. 我把你的钥匙放在抽屉里以免丢失。