A few wore oxygen concentrators strapped to their torsos, hissing and sighing softly like a distant shoreline.

有几个人的身上绑着氧气浓缩器，像遥远的海岸线一样发出嘶嘶的叹息。

This is done in large factories. The other source of oxygen, somewhat less pure, is small, mobile plants called oxygen concentrators.

这一过程是在大工厂里完成的。另一种纯度稍低的氧气来源于一种小型的、可移动的氧气浓缩器。

Wang says the Chinese government's humanitarian aid to Syria includes first-aid kits, blankets, cotton clothing, tents, ventilators, anesthetics, and oxygen concentrators. The materials will be shipped as soon as possible.

汪文斌表示，中国政府援助叙利亚人道主义物资包括急救包、毛毯、棉服、帐篷及呼吸机、麻醉剂、制氧机，这些物资将尽快启运。

And then they were also trying to use these oxygen concentrators which pull oxygen from the environment, but they rely on power and they were running out of diesel for the generators.

然后他们还尝试使用这些氧气浓缩器从环境中提取氧气，但他们依赖电力，而发电机的柴油已经耗尽。