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- In mining, if the hard roof is submitted to shear failure, the sidesteps might sink or even collapse. 摘要综放面开采过程中，坚硬顶板超前剪切破坏，会造成工作面台阶下沉，甚至工作面整体垮落。
- The movement of hard roof in manless working face extraction has been simulated with three dimensional distinct element code for dividing into four stages. 分4个阶段模拟了无人工作面开采坚硬顶板采场顶板的运动规律。
- Through changing the face support fashion,the hard roof is managed by cutter top supports to increased cutter top resistance in Qitaihe Tiexi Coal Mine. 七台河铁西煤矿通过改变工作面支护方式,使用切顶支架增大切顶阻力来管理坚硬顶板,使坚硬顶板得到了较好的控制,杜绝了顶板事故的发生。
- Hard-top convertibles have become increasingly popular because they offer the top-down fun of a convertible with the quietness and security of a hard roof when the top is up. 硬顶敞篷车开始越来越流行，因为他具备了敞篷车的乐趣和全顶车的安全。
- In view of the compound hard roof of Six picks the area,through carrying on the comprehensive servation and the mechanics analysis appeared to pressure appears of the working face production process. 针对复合型坚硬顶板的六采区,通过对工作面生产过程的矿压显现进行了全面观测和力学分析。
- The longwall may relax some safety problems, but the other safety problems such as hard roof rock, the colliding and friction of the caved rock each other may be induced or intensified . 但是也可能诱发一些安全问题,如坚硬顶板对支架的冲击、采空区垮落岩石的撞击与摩擦诱发瓦斯事故等。
- The hardness and thickness of coal seam play a great role in the vertical distribution of stress in coal and the occurrence of rock bunt under the condition of hard roof and hard floor. 在“两硬”条件下，煤层厚度与硬度的变化对煤体中的应力分布有着很大的影响，从而对煤岩体系统中冲击矿压的发生有着很大的影响。
- 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。
- Central caving method in full-mechanized face under hard roof 坚硬顶板条件下综采工作面中部放顶的方法
- John felt it hard to rig out his family. 约翰感到难以为一家大小置备衣着。
- Controlling Design of Working Face with Thick and Hard Roof 厚层坚硬顶板采场控制设计
- 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。
