B2 [ U ] the state of being convenient方便,便利;合宜;近便
B2 when you want在…方便的时候
as soon as you like or can尽快
C1 [ C ] a device or machine, usually in the house, that operates quickly and needs little effort(通常指房子里的)便利设施;方便装置
[ C usually plural ] also public convenience formal a public toilet公共厕所
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