举个极端的例子，以单一作物为主的农田是如此不稳定，一年的坏天气或单一害虫的入侵可以摧毁整个作物。

To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop.

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最后，长期受益于更稳定单一货币的德国出口商，将会由于马克急剧升值导致出口再次触底而怨声四起。

Lastly, German exporters, having been big beneficiaries of a more stable single currency, would howl at being landed once again with a sharply rising D-mark.

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希腊的债务危机极大地暴露了欧盟在管理预算赤字限额上的有心无力，对赤字上限有着硬性规定的《稳定与增长公约》旨在巩固单一货币。

The Greek crisis cruelly exposed the EU's inability to police the budget-deficit limits imposed by the stability and growth pact, which is meant to underpin the single currency.

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