n. 

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at once,
at one stroke,
at one time,
at present,
at random,
at regular intervals,
at school,
at sea,
at six,
at stake,
相似单词
avisandum,
aviso,
avitaminosis,
avitaminous,
Avitene,
avitrice,
Avitron,
Aviva,
avizandum,
AVL,