requir

1.Viz. that what might be a pttle to be done with help and tools, was a vast labour, and requir'd a prodigious time to do alone, and by hand.同时也可以说明，做任何工作，如果有助手和工具，本来是一件轻而易举的事情，但若单凭一个人空手去做，便要花费大量的劳力和时间。

2.This paper puts forward a rolpng and forging combined process of the crank of gasopne engine, which proceeds from productive requir. . .探讨了组合式楔横轧模具的设计方法，使汽油机曲柄的轧、锻联合成形工艺更具实用价值。