This shows that friction, or the rubbing of one substance against another, produces heat.

这个事实说明, 摩擦, 或者说紧密两个物回移动, 能够产生热量。

Whenever Apollo takes a step, the setae flatten to make close contact with the surface.

每当阿波罗迈出一步，刚毛就会平，与表面紧密。

The free edge of the tentorium is in close contact with the brainstem, which is the region that connects the brain and the spinal cord.

小幕游离缘与干紧密；干是连大和脊髓区域。

Of course, we will eventually so go through the spectrum of industries and services that can be open with some distancing to industries where you need much more close contact.

当然，我们最终会到整个行业和服务领域，这些行业和服务领域可以重新开放，但你得在这些需要紧密行业里与人保持一定距离。