It should be sharp and not tempered so it will break.
应该把它磨得很锋利，不要回火锻造，免得它会断裂。
The question is sharp, answers should be diversified.
问题是尖锐的，答案应该多样化的。
On the physical side, how much sleep should I get to be sharp?
在生理方面，睡眠多长时间以使你保持敏捷？
On the physical side, how much sleep should I get to be sharp?
在生理方面，睡眠多长时间以使你保持敏捷？
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