This disease is surprisingly difficult to catch, as most people have a natural resistance to it.

这种病令人惊讶的难以患上，因为大多数人对它有一种先天的免疫力。

《柯林斯英汉双解大词典》

'Like Sophia Loren,' another angler piped in, and 'equally difficult to catch.'

另一名垂钓者说，她像是索菲娅·罗兰(Sophia Loren)，都同样难以逾越。

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However even in New Zealand the species are threatened and difficult to catch.

然而即使在新西兰，这个物种也因受到威胁而难以捕获。

youdao

For hunters,these five animals were some of the most difficult and dangerous to catch.

VOA: special.2009.08.19

While some of their clients are middle class professionals from the community at large, many brothels will only accept a narrow clientele to make it difficult for law enforcement to catch them.

VOA: standard.2010.05.24

But it will be much more difficult to catch up with the US - Silicon Valley.

BBC: Q&A: Where will China's innovators come from?

But the world moves so fast that once you fall behind, it can be very difficult to catch up.

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"In such a short leg it was always going to be difficult to catch anyone that got away, " said skipper Smith.

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