ball ring

基本解释

Assign a shape to each number: 0 looks like a ball or ring;
将每一个数字都想象成一个形状：0看起来像一个球或环；
The anti-wear and friction-reducing properties were evaluated by using four-ball and ring-on-block tribotesters.
以十二烷氧基硼酸镧为添加剂，采用四球实验机和环-块摩擦实验机评价了其抗磨减摩性能。
Pressure on the ball bearing outer ring with a flat seat type, aligning seat type and seat type with a self-aligning washers.
压力球轴承外圈有平面座型、调心座型和带调心垫圈座型。