你的头发需要多久洗一次？
我需要一本词典，因此我要去趟书店。(2)你的头发需要多久洗一次？(3)你不必每天洗车。
How often does your hair need washing? (3) you don't need to wash your car every day.
我需要一本词典，因此我要去趟书店。(2)你的头发需要多久洗一次？(3)你不必每天洗车。
How often does your hair need washing? (3) you don't need to wash your car every day.
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