During the expedition, they trekked ten to thirteen hours a day.
在探险期间，他们每天都要走十到十三个小时。
Later investigation showed we had been in the water for thirteen hours.
随后的调查先是我们在水中待了13个小时。
S. estimates that taxpayers need an average of about thirteen hours to prepare tax documents.
美国国税局估计，一个纳税人平均需要13小时来准备这些税收文件。
S. estimates that taxpayers need an average of about thirteen hours to prepare tax documents.
美国国税局估计，一个纳税人平均需要13小时来准备这些税收文件。
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