In normal circumstances merely placing a layer of protective material on top of a levee in this way would not do much good.
一般来说如果只是这样在堤坝顶部铺一层类似的保护材料在漫坝时不会起到什么作用。
2
Pack carburizing consists ofplacing the parts to be treated in a closed container with some carbonaceous material such as charcoal or coke.
固体渗碳的方法是将要处理的零件与木炭或焦炭这些含碳的材料一起放入密闭容器。
3
The box body is provided with at least one groove for placing jewelry, and the part of the box cover corresponding to the groove is made of transparent material.