导致这次让人紧张的美元贬值的原因似乎是多方面的。

Those nervously inclined see plenty of reason to fret.

youdao

没几个美国人将这一巨变单纯归因于美元贬值或商业周期循环这些显而易见的原因。

to such obvious causes as a devalued dollar or the turning of the business cycle. (NETEM 2000, Passage 1, Paragraph 4)

youdao

对美元来说，令人担忧的原因在于，如果发生贬值，将会促使外国的投资者们对长期国债回报率有一个更高的要求，以作为对他们风险的补偿。

As for the dollar, the reason to worry would be if a falling currency prompted foreign investors to demand higher yields on American Treasury bonds to compensate them for the risk.

youdao