We don't have to shim or glue.

们不需要或胶水。

This is what a spacer looks like.

这的样子。

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

于他更换了正时链条和导轨， 还做了缸盖等，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，这两块极小的金属，实质上直接接触心脏组织的小金属。

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

们可以通过调整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.

当们为 镜头，有几个关键的区别。