发现病人呼吸困难。
The patient was perceived to have difficulty in breathing.
不断增加的`经济困难迫使他采取了铤而走险的办法。
His increasing financial difficulties forced him to take desperate measures.
让自己长时间聚精会神是很困难的。
It is difficult to make oneself concentrate for long periods.
呼吸困难的病例随空气污染的加剧而增加。
Cases of breathing difficulties increase in lockstep with air pollution.