Nucleation of crack is due to dislocation pile-up mechanism and elastic anisotropy mechanism.

裂纹形核主要是通过位错堆积、晶界角源及弹性各向异性三种机理产生的。

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This policy may be most useful in migration scenarios when coupled with some sort of clean-up mechanism associated with the alternate source.

在迁移场景中，当与关联于备用源的某些类型的清理机制结合使用时，这个策略可能是最有价值的。

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The principle of the system is introduced and design of probe pick-up mechanism, gas control system, hardware and software have been described.

这里介绐了系统的工作原理并阐明了探头机构、气动控制部分和系统硬软件等的设计。

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The main goals of the summit are to agree on targets to cut to greenhouse-gas emissions and to set up a mechanism to provide developing countries with the billions of dollars needed to cope with climate change.

VOA: standard.2009.12.17

So what would I want to do? I'd like to somehow walk down each of the digits one at a time and add them up. Ah, that's a looping mechanism, right? I need to have some way of walking through them.

去取这个数的,每个数字然后把他们加起来,啊，这是个循环机制对不对？,我得找到一个遍历它们的方法,一种简单的方法可能。

麻省理工公开课 - 计算机科学及编程导论课程节选

And part of the reason for putting it up is that I want to, as much as possible, answer that question by separating out the mechanism, which is the computer from computational thinking. Right.

提出这个问题的原因有一部分在于,我想尽量，将计算机与,计算思维分开,来回答它。

麻省理工公开课 - 计算机科学及编程导论课程节选

The reactor also lacks a back-up mechanism to stop it overheating and exploding should the helium coolant escape.

ECONOMIST: Prospects for a new type of nuclear reactor look mixed

The lime-green devices run on electromotive energy from a wind-up mechanism--thus allowing the machines to be used in areas lacking a regular power supply.

FORBES: Intel's Barrett Dismisses $100 Laptop As 'Gadget'

Because a few years ago -- Turkish and American administration set up an mechanism sharing intelligence in regard to solving this problem.

WHITEHOUSE: Press Briefing