1·Each layer employs the services of the layer underneath, which enables a top layer protocol to transmit messages over the physical network.
每个层都使用下面一层的服务，这使得顶层协议能够在物理网络上传输消息。
2·One possibility is that the top layer of rock was shattered by the shockwaves from an impact.
一种可能的解释是顶层的岩石是陨石撞击的冲击波形成的。
3·When it was set down, I marveled, “I can’t believe how thin this top layer is!
当馅饼被放到桌上的那刻，我惊讶不已，“我简直不能相信馅饼的顶层竟能做得这么薄！
4·The file may not have been held correctly and some of the top layer of Minx was filed off.
该文件可能已举行了不正确的一些顶层的疯丫头是提出过。
5·But there is a better system, so that you do not need to turn the top layer, and can immediately see, which situation the cube is in.
但这里有一个更好的方法，你不需要转动顶层就能立刻看到这种是哪种情况。
1·The top layer of soil is a different color. Scrape it away and make straight lines, which are easy to spot from above.
Dill告诉我们，土的上层和底下的颜色是不同的，把上层的土挖掉，呈现出一条颜色相异的直线壕沟便于人们从上空发现你。
2·Now comes the really boring part, you'll have to take a copy of your background plate, and place it at the top layer.
现在到了一个烦人的部分，你需要拷贝一份背景图层，将其放置在最上层。
3·These affect only the top layer of the skin.
一度烧伤：只损伤皮层的最上层。
4·The top layer contains the text you just entered.
最上层包含您刚才输入的文本。