They all doubled up when I told my joke.
当我讲笑话时, 他们都笑得直不起身子来。
室；把…对折；弯曲；快跑；加把劲They all doubled up when I told my joke.
当我讲笑话时, 他们都笑得直不起身子来。
Because of the housing shortage, many couples had to double up in one tiny apartment.
由于住房紧
, 
对夫
只好
栋公寓里。
The sad news doubled him up.
噩耗使他悲痛欲绝。
The carpet won't double up.
这地毯不能折起来。
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