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单词 could
释义 could
 /kood/; unstressed /keuhd/,  v.  
  1. a pt. of can1.
 auxiliary verb.
  2. (used to express possibility): I wonder who that could be at the door. That couldn't be true.
  3. (used to express conditional possibility or ability): You could do it if you tried.
  4. (used in making polite requests): Could you open the door for me, please?
  5. (used in asking for permission): Could I borrow your pen?
  6. (used in offering suggestions or advice): You could write and ask for more information. You could at least have called me.
 [ME coude, OE cuthe; modern -l- (from WOULD, SHOULD) first attested 1520-30]
 Usage. See care.
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