没有特殊仪器的话，很难检测到漏煤气。 The drug test failed to detect any illegal substance. 药检并没有测出任何非法物品。 Screening can help detect cancer so it can be treated as soon as possible. 筛查有助于发现癌症，使其尽早得到治疗。 Helen 接下来我们来看 ...