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N-COUNT
浴室；盥洗室
A bathroom is a room in a house that contains a bath or shower, a washbasin, and sometimes a toilet.
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N-SING
洗手間；廁所
A bathroom is a room in a house or public building that contains a toilet.
例句
She had gone in to use the bathroom.
她去洗手間了。
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PHRASE
去洗手間；上廁所
People say that they are going to the bathroom when they want to say that they are going to use the toilet.
例句
Although he had been treated with antibiotics, he went to the bathroom repeatedly.
雖然他已經服用了抗生素，但他還是不停地上廁所。