如果 lgA 指数突然下降到某一水平以下，训练就会降低难度或完全取消。

If lgA levels suddenly fall below a certain level, training is eased or dropped altogether.

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完全发达成熟的后工业社会，如欧洲的社会，其特点是人口稳定或下降，而老龄化却在增加。

Fully developed, mature, post industrial societies, such as those in Europe, are characterised by stable or declining populations which are increasing in age.

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但是这些下降几乎完全是由于股市的崩溃，从而使与其相关的实际资本收益下降了50%。

But that fall was due almost entirely to the stock-market crash, and with it a 50 percent reduction in realized capital gains.

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