vi.弯曲，下垂，枯萎
vt.使…下垂，使颓丧
n.下垂，消沉
See how they hang their heads and droop, and wither.
看!它们不是低着头,弯下腰, 就要枯萎了吗?
She was so tired, her eyelids were beginning to droop.
她太疲倦了，眼睑开始往下垂。
Don't let your spirits droop.
不要萎靡不振.
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