在抑郁时，他们可能感到痛苦忧伤、无望和难以行动。
During depression, they might feel painfully sad, hopeless, and immobilized.
土壤非常泥泞，机器难以行动，所以救援人员尝试徒手挖掘搜寻幸存者。
The soil is too wet to be moved by machines, so rescue workers have tried to dig with their hands and shovels to search for survivors.
老年人是无人驾驶汽车的主要使用者之一，尤其是那些行动不便或难以自己开车的老年人。
Older adults, especially those with limited mobility or difficulty driving on their own, are one of the classic use cases for driverless cars.
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