近义词
n. 
词
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on credit,
on diet,
on display,
on duty,
on earth,
on end,
on file,
on fire,
on foot,
on guard,
相似单词
understudy,
under-sulfonate,
under-sun,
undersupply,
under-supply,
undersurface,
underswell,
underswept,
underswing,
undersynchronous,