Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thin layer of clay.

在最后一层白垩纪岩石和第一层新生代岩石之间，常常有一层薄薄的粘土。

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Using galvanised clout nails with large heads, start to nail the first layer of felt onto the decking.

使用镀锌的大头钉，开始把第一层毛毡钉在甲板上。

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They only painted the first layer fo poaint.

他们刚刷了第一层油漆。

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The artist can then add a second color of glass to make designs over the first layer of glass.

VOA: special.2009.09.16

First is that we have this mono layer of gold particles. So let's see if Professor Drennen is able to help us out here.

是如何做的,我们等会儿会自己做这个实验,我会问你们一些问题。

麻省理工公开课 - 化学原理课程节选

The way we did this was to coax embryonic stem cells first to develop into the surface layer.

我们是这么做的,先诱导胚胎干细胞,发育成外胚层。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

The upholstered furniture is the first layer, which I always think of as the canvas on which to paint.

WSJ: Mastering the Layered Look | Living Well

So is that not troubling that he got through that first layer?

WHITEHOUSE: Press Briefing

Is he not troubled that the first layer was a pass through, that the suspect got on the plane despite being on the list?

WHITEHOUSE: Press Briefing