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硬层
1、layer───vt.把…分层堆放；借助压条法；生根繁殖；将（头发）剪成不同层次；n.层，层次；膜；[植]压条；放置者，计划者；vi.形成或分成层次；[植]通过压条法而生根
2、clayey layer───粘土层
3、dense layer───[医]致密层
4、decarburized layer───[化工]脱碳层
5、oxide layer───氧化层
6、mucus layer───粘液层
7、arachnoid layer───蛛网膜层
8、cuticular layer───表皮（层），角化层；表皮层
9、outer layer───外层（细胞次生壁外面的一层）
1、rice husk is a ligneous hard layer of the cereal with high silicate content.───稻壳灰是具有高硅酸盐含量的谷类的一种木质的硬层。
2、If there had not been a hard layer of rock beneath the soil.───如果不是因土壤下面有一层坚硬的岩石。
3、Soon layer of oceanic ooze began to accumulate above the old hard layer.───很快，海洋软泥层开始在原先的硬地层上面堆积起来。
4、The orientation control of the primary carbides in the hard layer is studied.───对初生碳化物定向生长控制进行了探讨。
5、Gas storage well should be built on hard layer.───对于储气井选址宜选硬质地层；
6、If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.───如果土壤下面没有坚硬的岩层，他们早就在几个小时内完成这项工作了。
7、The narrower the hard layer, the significant the effect.───随着硬夹层宽度的减小，这一影响越来越明显。
8、When the robotic arm first reached that depth, it hit a hard layer of frozen soil.───当机械臂首次达到那个深度的时候，碰到了一层坚硬的冰冻土壤。
9、is a hard layer on or near the surface of soil.───是土壤表面或其附近的一层硬物。
1、The rice husk is a ligneous hard layer of the cereal with high silicate content.
2、Soon layer of oceanic ooze began to accumulate above the old hard layer.
3、DLC technique is already applied in electronic products to produce a hard layer; KMC is the first to adopt this technique on the chain product successfully.