Fifteen minus five — there are only ten days to go now.
15天刨去5天，只剩下10天了。
Five days is too long to go without having a break.
五天当中没有太长时间可以休息。
Lucy and I go to school five days a week.
我和露茜每星期上五天学。
Tom and I go to school five days a week.
我和汤姆一周上五天学。
Tom and I go to school five days a week.
我和汤姆一周上五天学。
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