一般一个手表防水圈，只能用三年左右，因此，每隔三年要换一次手表的防水圈。

Generally a watch waterproof ring, only three years or so, so every three years to change a watch waterproof ring.

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一般一个手表防水圈，只能用三年左右，因此，每隔三年要换一次手表的防水圈。

Generally a watch waterproof ring, can only be used for about three years, therefore, every three years to change a waterproof watch.

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每隔三年，金融系统就会酝酿一次巨大的风险，这意味着我们还会面对另外一场危机。

There is an enormous risk we will continue to have another crisis in the financial system every three years.

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