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on guard
释义
on guard
adj. phr.
Watchful; watching. 警惕，提防；警戒。
◆ The police warned people to be on guard for pickpockets during the Christmas rush.
警方提醒人们在圣诞节的购物热潮期间要提防扒手。
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on a roll
on a shoestring
on a string
on behalf of
on behalf of
on board
on board
on borrowed time
on call
once and for all
once bitten, twice shy
once in a blue moon
once in a while
once-over
once upon a time
on cloud nine
on condition that
on credit
on deck
on deposit
on duty
one and the same
one-armed bandit
on earth
on easy street
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更新时间：2026/3/1 2:41:31