Cases of breathing difficulties increase in lockstep with air pollution.

呼吸困难的病例随空气污染的加剧而增加。

《牛津词典》

Many people suffered breathing difficulties.

许多人因此呼吸困难。

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The boy had breathing difficulties and died when he was three days old.

三天后，这个孩子由于呼吸困难而死去。

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These include a severe cough and breathing difficulties, ear infections, pneumonia and eye infections.

BBC: Q&A: Measles and MMR

In 1999, the Dutch scientists found 12 seal pups with breathing difficulties, stranded on the coast.

BBC: Wild

Street went to hospital five days before he died, suffering from back pain and breathing difficulties.

BBC: The Temptations