to double up as
01
兼作, 同时充当
to have another function in addition to the main one
语法信息
形态构成
短语
动作动词
规则
不可分离
小品词
up as
基本动词
double
现在时
double up as
第三人称单数
doubles up as
现在分词
doubling up as
一般过去时
doubled up as
过去分词
doubled up as
例子
The sofa doubles up as a guest bed.
沙发还可充当客床。
