They laugh so hard they double up with laughter.他们捧腹大笑，直不起身来。The carpet won't double up.这地毯不能折起来.The lids of the casserole dishes are designed to double up as baking dishes.砂锅的盖子被设计成可兼作焙盘。...
The people fear not death; why threaten them with it.民不畏死, 奈何以死惧之.The clouds threaten rain.云预示有雨.Will severe selection standards create elitism and threaten the Olympic ethic of participation?严格的选拔标准是否会造成精英主义，进而危及奥林匹克重在参...
The psychiatrist must learn to maintain an unusual degree of objectivity.精神科医生务必要学会保持超乎寻常的客观态度。It is not unusual for women to work a 40-hour week.女性一周工作40小时并不少见。Reports of the plot of this unusual film tend to excite rev...