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挑戰(zhàn)

?challenge to battle; throw down the gauntlet;throw down the glove
?challenge to a contest
發(fā)出～issue a challenge/接受～take up the gauntlet;accept a challenge/躲避～ duck a challenge/對對方的～無動于衷show no reaction to the other side’s toss of the glove/富有～性的任務(wù)challenging assignment/～書letter of challenge;challenge