The dioxins pollution control including conventional removal techniques and degradation techniques is introduced.二恶英的污染排放控制技术则介绍了传统的去除技术和一些降解技术.Cremation pumps dioxins, hydrochloric acid, sulfur dioxide, and carbon dioxi...
莫莉已经努力克服了对飞行的恐惧。Molly had fought and overcome her fear of flying.载人宇宙飞行的前景看上去充满了越来越多的变数。The future for manned space flight is looking increasingly uncertain.蝙蝠是唯一的有翅膀且能持续飞行的哺乳动物.Bats are the only mammals to have wings an...