This is what a spacer looks like.

这就是垫的样子。

We don't have to shim or glue.

我们不需要垫或胶水。

We can control the fitting clearance by adjusting the thickness of the shim .

我们可以通过调整垫的厚度来控制隙。

Interchangeable thumb inserts can break and come out mid-release and they can really hurt your thumb joint.

可互换的拇指垫在释放过程中可能并脱落，这真的伤到你的拇指关节。

So it's two very small pieces of metal, essentially little metal pads that contact the cardiac tissue directly.

因此，这是两块极小的金属，实质上是直接接触心脏组织的小金属垫。

And when we construct a ray diagram for a diverging lens, there are a few key differences.

当我们为 镜头垫，有几个关键的区别。

So he did timing chains and guides and did head gaskets and all that, and it still doesn't run right.

于是他更换了正时链条和导轨， 还做了缸盖垫等，但车子依然运转不正常。