而我们所需要的是一种廉价的能够测出毒气的方法，从而及时发出警报，并且这种方法还要能够鉴别出毒气的类型，好让那些已经中毒的人得到及时的治疗。
What is needed is a cheap way of detecting such gases and, having raised the alarm, of identifying which gas is involved so that anyone who has succumbed can be treated.
而我们所需要的是一种廉价的能够测出毒气的方法，从而及时发出警报，并且这种方法还要能够鉴别出毒气的类型，好让那些已经中毒的人得到及时的治疗。
What is needed is a cheap way of detecting such gases and, having raised the alarm, of identifying which gas is involved so that anyone who has succumbed can be treated.
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