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We shall know more about our sleep if we spend more than one-third of our lives sleeping.
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We know relatively little about our sleep; as a result, we spend about one-third of our lives sleeping.
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Despite spending about one-third of our lives sleeping, we know relatively little about our sleep.
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We spend about one-third of our lives sleeping so that we know relatively little about our sleep.
Đáp án: Despite spending about one-third of our lives sleeping, we know relatively little about our sleep.
Giải thích : despite + Ving: mặc dù
Dù dành khoảng 1/3 cuộc đời ngủ, nhưng chúng ta biết khá ít về giấc ngủ của mình.