骨折，不管什么原因，都是因为它强度小于它所能承受的应力。

If a bone fractures, for whatever reason, its strength is less than the stress it is subjected to.

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特殊黄铜又叫特种黄铜，它强度高、硬度大、耐化学腐蚀性强。

Special brass and call special brass, its strength and hardness, strong corrosive.

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然后你拿起那束纤维并稍微扭一下它，因为这样做可以进一步增加它的断裂强度。

Then you take that bundle of fibers and you twist it a little bit, because by twisting it, you increase its breaking strength even more.

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Or if we look at how strong it is, it's actually stronger than a single bond, but weaker than a double bond.

或者如果我们看键的强度的话，它实际上比单键更强，而比双键更弱。

麻省理工公开课 - 化学原理课程节选

So, another way to talk about dissociation energy is simply to call it bond strength, it's the same thing, they're equal to each other.

讨论离解能的另外一种方式,是直接称它为键的强度，它们是一样的，彼此相等。

麻省理工公开课 - 化学原理课程节选

So we see that we do not eject electrons in the case of the laser pointer, even if we have this intensity, it is still not related to the energy of an individual photon, so we won't see an effect.

所以我们看到我们用激光笔,还是没有逐出电子，即使我们有这样的强度，它仍然与一个单个的光子能量无关,所以我们不会看到光电效应。

麻省理工公开课 - 化学原理课程节选