1. Heavy industry pollutes our rivers with noxious chemicals. 重工业排放的有毒化学物质污染着我们的河流。
2. These noxious substances limit caterpillars' growth and reduce the number of eggs that female moths lay. 这些有毒物质会限制毛毛虫的生长，减少雌蛾产卵的数量。
3. Skunk, a noxious liquid mixture of nontoxic ingredients including baking powder and yeast, is blasted onto protesters from a water cannon. 臭鼬，一种由发酵粉和酵母等无毒成分混合而成的有毒液体，从高压水枪喷到抗议者身上。
4. Another experiment showed that house sparrows consumed less red food after they observed others eating red food that was treated so as to be noxious. 另一项实验表明，家养麻雀在观察到其他麻雀吃红色的食物以致有毒后，会吃更少的红色食物。
5. Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing. 虽然近年来机动车排放的有害污染物大幅减少，但机动车的数量一直在稳步增加。
