为了使凿刀和刨子好用且安全，必须保证他们的刃足够锋利。
Keeping a sharp edge on chisels and plane irons is absolutely necessary for the successful and safe use of these tools.
这块石板光秃秃的，凿石的人只想到这是筑墓石所需，除了使它够长够宽能盖住一个人之外，就没有考虑其他方面。
This stone is entirely blank. The only thought in cutting it was of the essentials of the grave, and there was no other care than to make this stone long enough and narrow enough to cover a man.
凿耕法和铧式犁翻耕法在短时间内使二氧化碳的排放增加。
Chisel and moldboard plowing increased carbon dioxide emissions for a short time.
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