/kənˈtrækt/
vt., vi.1. 缔结；订（契约）Their firm have contracted to build a double-purpose bridge across the river.他们公司已签约承建一座横跨大江的两用大桥。
2. 得（病）；负（债）；养成（习惯）He contracted a fever.他发烧了。
3. 使缩起来；使变狭；收缩；缩写Metal contracts as it cools.金属遇冷收缩。
'I am' is usually contracted to 'I'm' in oral speech.'I am'在口语中常常缩略为'I'm'。