When new or difficult material is presented, almost all listeners are faced with a challenge, because human's speech lacks the stability and permanence of the printed word.
当出现新的或困难的材料时，几乎所有的听众都面临着一个挑战，因为人类的语言缺乏印刷文字的稳定性和持久性。
Some of the solid material it brings up may come from a so-called diamond-stability field, where conditions of pressure and temperature are conducive to the formation of diamonds.
它所带出的一些固体物质可能来自所谓的钻石稳定场，那里的压力和温度条件有利于钻石的形成。
When new or difficult material is presented, almost all listeners are faced with a challenge because human speech lacks the stability and permanence of the printed word.
当面对新资料或难度较大的资料时，几乎所有的听众都会面临挑战，因为人类口语缺乏书面文字的稳定性和永久性。
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