a sofa that converts to a bed
英语听力文摘 English Digest 244、光呼吸作用之谜 ... ~ into/to sth: be able to be changed from one form or use to another 可改变形式或用途: a sofa that converts (in) to a bed 可改为床铺的沙发. To minimize the risk of burglary, install a good alarm system. 安装可靠的报警设备以减低被盗的风险. ...
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