There was a sudden fall in temperature.

气温一下子降低了。

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The sudden fall knocked one tooth out of his mouth.

他突然摔了一跤，把一颗牙齿从嘴里碰出来了。

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He had been the king's favourite, and his sudden fall from grace surprised everyone.

他本是国王的幸臣，一朝失宠众人无不感到意外。

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If investors were worried about losing those gains, they would be paying up for options to protect against a sudden fall in share prices.

ECONOMIST: Buttonwood: Premium bonds | The

The paper says moves to equalise the tax system would have to be carried out more slowly to avoid a sudden fall in living standards.

BBC: Pensioners should pay more tax, argues Fabian Society

And, having reached the mid-competition break in second place behind North Division leaders Lancashire on 4 June with four wins from their first six games, the Tykes' sudden fall from grace has been unexpectedly abrupt.

BBC: Vaughan absent as Tykes miss out