twice

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It's an event that only happens once or twice a year at the most.
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It's an event that only happens once or twice a year at the most. 而且一年最多也只发生1～2次

happens event twice once most or an year at only it's that the a
Males may be twice the size of a female
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Males may be twice the size of a female 公熊体型可能是母熊的2倍

twice may males size be female of the a