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Soft coal burns with more flames than hard coal. 烟煤燃烧时火焰较无烟煤多。
Finally great depth of burial, long time and higher temperature may metamorphose the lignite into soft coal or bituminous coal and in extreme cases, to hard coal or anthracite. 褐煤经长时间进一步的深埋以及较高的温度的作用，便可变成软煤或烟煤，再进一步变化，便成了硬煤或无烟煤。
In this paper, the basic physical and themical properties of the pulverized bituminous and hard coal used in XISCO (Xiangtan Iron and Steel Company)B. 作者测定了湘钢高炉喷吹用烟煤与无烟煤粉的基本物理化学性能,进行了烟煤与无烟煤混合喷吹的试验研究;
The combustion characteristics of a hard coal, two kinds of biomass and their blends were investigated by thermogravimetric analysis. 本文通过热分析技术,对无烟煤、玉米秸杆与废弃加工木屑两种生物质及其混合物的燃烧特性进行了实验研究。
Sublevel caving technique has been utilized in Datong mining area under hard rock and hard coal, problems including low recovery ratio and spontaneous fire in gob have been overcome to achieve safe and high prodction. 大同煤矿集团“两硬”条件侏罗纪厚煤层下分层工作面应用低位放顶煤开采技术,解决了传统工艺所造成的煤炭资源回收率低、空区自然发火危险程度高等技术难题,实现了安全高效开采的目的。
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。
Hard training will fit them to run long distances. 严格的训练将使他们能跑长距离。
Seth really took it hard when his old dog died. 塞思的那条老狗死的时候，他确实怏怏不乐。
Heavy taxes indispose a citizen to work hard. 重税于国民不愿意辛勤工作。