loose与slack这两个形容词均含“松驰的”之意。
loose : 常用，通俗。指人的精神或东西的松驰。
- There were some loose wires hanging out of the wall.
墙上搭着几根没有接好的电线。 - The nails in the wall had worked themselves loose.
桥上的钉子已经松动了。
slack : 强调缺乏牢固性或稳固性，不坚定。
- These tent ropes are too slack - they need tightening.
这些帐篷绳太松了——需要把它们紧一紧。 - She was staring into space, her mouth slack.
她双唇微张，失神地望着前方。
