许多人用一个电子阅读器连续阅读一部大部头的书会感觉很累，尽管这也许是因为他们对这种新媒介不熟悉。
And many people find it tiring to read consecutively a long work on an electronic reader, though that may just be a matter of lack of experience with the new medium.
一个人可以睡足够长的时间，但是仍然感觉很累，是因为他们的睡眠质量不好。
A person could sleep the recommended amount, but still feel tired because he or she got poor quality sleep.
一个人可以睡足够长的时间，但是仍然感觉很累，是因为他们的睡眠质量不好。
A person could sleep the recommended amount, but still feel tired because he or she got poor quality sleep.
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