今天很少有动物去吃这种植物，因为这种植物含有很多硬硅酸盐类物质，这种物质对牙齿很不好。
Few animals feed on them today because they contain a lot of hard silicate which is bad for teeth.
这种物质硬如磐石（石灰石主要就是由碳酸钙构成的），但易溶于酸。
The stuff is tough as a rock (limestone is made primarily of calcium carbonate), but it dissolves instantly in acid.
如果要检测硬度，陨石的标本就太小，它只能显示出这种物质无疑比一般钻石硬。
The sample from the meteorite was far too small to test for hardness, except to show that it is certainly harder than regular diamonds.
发射硬x射线调制望远镜，研究致密天体和黑洞强引力场中物质动力学和高能辐射过程。
It plans to launch a hard X-ray modulation telescope to study the matter dynamics and high-energy radiation processes in the strong gravitational field of compact celestial bodies and black holes.
避免和尖硬锐利的物质擦碰，避免受高压高热及化学试剂的腐蚀，以免擦毛或损伤。
Avoid and sharp hard sharp material to avoid the corrosion of high heat and chemical reagents, so as not to rub the hair or damage.
一手抓物质文明，一手抓精神文明，两手抓，两手都要硬。
Push for material advancement on one hand and ethical progress on the other, with Both hands working hard all the time.
硬渣、污物或任何外部物质在管道内积累都可能妨碍阀门的工作效率并严重损坏阀门的关键部件。必须用空气或蒸气对管道内部进行彻底清洗。
Grit, dirt or any foreign matter accumulated in the pipe can hinder efficient valve operation and seriously damage vital valve parts. Thoroughly clean pipe internally with air or steam.
指甲指甲由称为角质的硬脆物质组成。
指甲指甲由称为角质的硬脆物质组成。
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