steel ball

常见例句

Yang designed a dashboard mount filled with steel ball bearings and lined with silicon.
杨全国设计了一种以钢珠轴承填充并以硅衬底的仪表盘座架。
The point: that a period of a pendulum is independent of the mass — the steel ball, plus one professor — hanging from it.
目的是证明：钟摆周期和质量无关 – 那个铁球的，以及挂在上面的那个物理教授的。
In another lecture on pendulums, he stands back against the wall, holding a steel ball at the end of a pendulum just beneath his chin.
在另外一节钟摆课上，他背靠墙站着，抓着钟摆末端的铁球，紧贴着他的下巴。

Inside there are just three stainless-steel ball bearings, housed in anodized aluminum bar stock.
FORBES
After throwing a foul, Nelson stepped into the throwing circle for the second time and told himself to "see it" — the whirling move through the circle, the soaring steel ball.
NPR: Shot-Putter Nelson Fails To Make Olympic Grade
Cycling's innovations, including spokes, pneumatic tyres, ball bearings, steel tubing and differential gears, were soon borrowed by the motor industry.
ECONOMIST: How Robert Penn found himself the perfect two-wheeler