To make a transducer by painstakingly micro-machining a brittle block of ceramic material can take many hours of work, though.
但是制造一个换能器需要利用微机械技术，在一块质地脆硬的陶瓷材料上精心加工，耗费数个小时才能完成。
But let those crystals grow to five nanometers, and the material becomes weak and brittle.
但是当那些晶体增大到5纳米时，天然丝就变得脆弱而且易脆了。
Fracture mechanism, initiation and propagation of cracks, and the control method of cracks in rock like brittle material under dynamic load are described in this paper.
本文主要论述了动荷载作用下岩石等脆性材料的断裂破坏机理、裂纹形成与扩展以及裂纹的止裂与控制等内容。
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