A target function for design of hydraulic hand drills is brought forward in this paper.

提出了设计手持式液压凿岩机的目标函数。

youdao

Founders of the polar circle diving center are making holes in the ice with help of hand drills and augers.

极地圈中心的创建者正在冰里用钻孔机钻孔。

youdao

The ball still seems to pop out of his hands a lot. Perhaps he should work on those hand drills a little more. I thought he was better last March in that area then he has been this season.

球从他手中掉出来仍然好多。也是他要更多的训练接球。我认为他接球握球方面，他在今年三月份做的要比现在做的好。

youdao

Once that was done, he set to the real work: with hand drills, handsaws (their teeth rubbed, to run more smoothly, with a candle end), his bevelled-edge chisel and his wide, heavy, trusty Number 7 plane, which he used for everything.

ECONOMIST: Alan Peters