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。
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)。
The hammer is a metal ball attached to a wire and a handle.
链球是一个连接了一根铁链和把手的金属球。
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。
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。
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。
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