您要查找的是不是：
- 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石，他们早就在几个小时内完成这项工作了。
- 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石，他们早就在几个小时内完成这项工作了。
- 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。
- The existence of a relatively hard layer just below the raft can remarkably enhance the load bearing action of raft. 地表硬壳层的存在能够有效地提高筏板的分担作用。
- Inside the tooth, under the white enamel and a hard layer called the dentin, is a soft tissue called the pulp. 在牙齿内部，在白色的牙釉质和（淡黄色）硬质的牙本质下，是被称作牙髓的软组织。牙髓组织中包含了血管、神经和结缔组织。
- The thick cooling hard layer exists on the surface of titanium alloy billet formed under conventional extrusion condition. 钛合金常规挤压时表面存在很厚的冷硬层,导致挤压抗力急剧升高,严重影响坯料成形。
- The purpose of French polishing is to blend the hundreds of microscopic layers of shellac into one single, high quality, hard layer of shellac. 虫胶涂装就是要把千百层非常薄的漆形成一个融合的层，这样才会有最好的质量和硬度。
- Heat treated layer, carbonized layer, hardened hard layers, superficial coating, steels, non-ferrous metal, micro and thin shaped components. 热处理、碳化、淬火硬化层，表面覆层，钢，有色金属和微小及薄形零件等。
- It is hard to sleep without a cooler in this room. 没有空气调节器，在这间屋里很难入睡。
- John felt it hard to rig out his family. 约翰感到难以为一家大小置备衣着。
- The hard core in the party make all the decisions. 这个党的核心成员决定一切。
- Hard copy is computer output on paper, printing or graphics. 硬拷贝是出现在纸上、印刷上或图表上的电脑输出。
- I scrubbed hard at the stain to see if I could get it off. 我使劲擦这个污迹，看能不能将它去掉。
- It's natural to slack2 off towards the end of a hard day's work. 一天紧张工作快结束的时候有些放松是自然的。
- He pushed hard on the brake pedal to avoid a collision. 他使劲踩下煞车踏板以避免撞车。
- One can not learn a language well unless one works hard. 学好一种语言非下苦功不可。
- Let's collect the sap before its consolidation into a hard mass. 让我们在树液坚固成团之前将之收集起来。
- He owes his opulence to work hard. 他的财富乃辛勤工作得来。
- She was trying hard to disgorge a fish bone. 她拚命想把鱼刺吐出来。
- The emery is a hard metallic substance. 金刚砂是非常坚硬的金属物质。
