The chair isn't very sturdy. Don't move backwards and forwards when you are on it.
这椅子不结实, 别在上面前俯后仰地乱动.
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一通无厘头式的开场白,便把全场观众逗得前俯后仰.
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English travelers kept their friends in stitches while describing this ridiculous Italian custom.
英国的旅行家们叙述这个可笑的意大利风俗时,总是使他们的朋友们笑得前俯后仰.
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They burst into laughter and hung on each other's shoulders for support.
她们不由得前俯后仰地大笑起来,彼此靠着肩膀才没有倒下去.
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