hammer ball的意思|示意

And what I do is, I select a hard stone hammer, in this case a quartzite pebble about the size of a cricket ball, and I elect to hit it in one place - and this is where I start to knap.

我要做的就是，选择一块够硬的石锤，这次我选这块是个头有板球大小的石英岩卵石。先挑个地方锤下去，接着我就开始从这地方开始凿了。

He set a very big iron ball and a big hammer on the stage.

他在讲台上放置了一个很大很大的铁球和一把铁锤。

If I throw up a hammer, then the center of mass and only the center of mass will just go along a perfect parabola as if it were just a tennis ball.

我若是抛铁锤，那么质量重心，也是唯一的质量重心，会沿完美抛物线运动，就像一颗网球。

He picked up a ball-peen hammer, leaned on the passenger-side fender, and tapped twice on the EGR valve.

他拿起一个榔头，在右侧挡泥板前弯下身，轻轻敲了两下废气循环阀。

Uses: in the mining, cement, electricity, road machinery, refractory material has been widely used, common in the lining plate, hammer, grinding ball material.

用途：在采矿、水泥、电力、筑路机械、耐火材料等方面应用十分广泛，常见于衬板，锤头，磨球材质。

The impact force is applied by a falling steel ball instead of the spring hammer (USA).

用一个跌落的钢球而不是用弹簧冲击器来施加冲击力(美国)。