He burned all the important documents for fear that they should fall into the enemy's hands.

他把所有的重要文件全部烧毁以免落入敌人的手中。

youdao

Plenty of folks are so contrary that if they should fall into the river, they would insist upon floating upstream.

有许多人总故意作对，他们即使掉进河里，也还会坚持往上游漂。

youdao

Libraries are an investment for the future and they should not be allowed to fall into decline.

图书馆是对未来的一种投资，不应该让图书馆衰落。

《柯林斯英汉双解大词典》

Mr Dell added that the new touchscreen products would cost more to produce than their non-touch equivalents, suggesting they should fall within the price bracket Dell targets, rather than the super-low end of the market that it had opted out of.

BBC: Dell looks to future tablets as consumer sales slump

And should they fall, the monarchy in Saudi Arabia could be next.

FORBES: Oil Shock, 2011

And the way the road team recovered from a 17-point hole the biggest comeback in NFC championship history bodes well should they fall behind early in two weeks.

WSJ: NFC Championship: San Francisco 49ers Win Spot in the Super Bowl