到这里，我们最好暂停一下，来研究机制中最不可控制、同时也是最不可思议的一个因素：货币流通速度。

At this point we had better pause to examine that least controllable and most mysterious of all elements in the machine, the velocity of money.

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同时，在一些事件中，我们有一些不可控制的人为因素把这些宝贵的企业置于艰难的困境。

At the same time, we have some uncontrollable and, in some cases, man-made circumstances that have put some of these treasured businesses in very difficult straits.

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尽管澳航本身和航空分析人员一再强调，最新两起事件是由不可控制的因素导致的，与早前的空客A380引擎故障并无关联，但还是引起了各方的特殊关注。

The string of latest incidents is unrelated to the A380 scare and is caused by uncontrollable events, the airline and a commercial aviation analyst said.

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