Humility can sometimes be confused with a lack of confidence.
谦逊有时会被误认为缺乏自信。
More than 80% of those cases can be attributed to contact with contaminated water and a lack of proper sanitation.
其中80%以上的病例可归因于接触了受污染的水和缺乏适当的卫生设施。
Here the researchers must speculate a little. They suggest the answer may be the lack of association with other humans during the period of sleep.
这里研究者得做一些推测,他们认为答案可能是睡眠期间缺少与他人的交流。
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