OK, we've seen about spheres and cylinders centered at the origin or centered on the z axis.

我们已经知道,中心在z轴的球体和圆柱体。

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This section describes the servicing of crankshafts, main bearings, and engine Blocks and cylinders.

本节介绍曲轴、主轴承、发动机机体和气缸的维修。

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Many balls and cylinders that roll are ideal – as long as there are no small or moving parts and the size is appropriate.

许多球和圆棒都是很理想的玩具——随着时间流逝，那些玩具上面没有可以活动的小部件，并且它们的大小也合适。

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The treadle pump is easy to build from bamboo or other wood and two metal cylinders with pistons.

VOA: special.2009.08.17

She saw machines,tubes,cylinders and other containers for chemical experiments.

VOA: special.2009.09.26

But maize flour and cylinders of cooking gas, two staples for the poor, have become scarce and expensive.

ECONOMIST: Venezuela's strike

Officials said they were working to extricate the remaining survivors and had passed oxygen cylinders and water to those still trapped.

BBC: Dhaka building collapse: Factory owners arrested

He adds that teams from the army, the fire service and border guards had been drilling holes through concrete walls and pushing through oxygen cylinders and water bottles in an attempt to keep those trapped alive until they could be freed.

BBC: Dhaka building collapse: 'Large group' found alive