Learner's definition of BEWARE
: to be careful : to act in a way that shows you know that there may be danger or trouble谨防;当心;注意 —
used only as beware or to beware只用作beware或to beware [no object]
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A ghostly voice cried “Beware!”一个幽灵般的声音喊道:“当心!”
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Let the buyer beware.提醒买家注意。
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He told them to beware.他告诉他们要当心。
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often + of [+ object]