We don't have to shim or glue.

我们不需要垫或胶水。

This is what a spacer looks like.

这就是垫的样子。

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， 了缸盖垫等，但车子依然运不正常。

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，实质上是直接接触心脏组织的小垫。

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配合间隙。

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会断裂并脱落，这真的会伤到你的拇指关节。

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。