Keywords: ahazard potency of debris flow, externality, cost - benefit analysis.关键词: 土石流特定水土保持区 、 外部性 、 成本效益 分析.Pollution is considered as a form of negative externality in economic growth.摘要环境污染是经济增长过程中的“负产品”.The damage ...
The crew spent two days and nights in their raft.船员在救生筏上呆了两天两夜。His face was covered with the stubble of several nights.他几天没刮胡子，脸上胡子拉碴。The streets are still full of debris from two nights of rioting.街道上仍到处可见连续两晚的骚乱留下的残迹。...
我真的非常抱歉，我得走了。I do hope you'll forgive me but I've got to leave.“我们俩在同时讲话。”——“噢，抱歉。”"We're all talking at the same time." — "Yeah. Sorry."嗯，很抱歉，我以为你是法国人。Hum, I am sorry but I thought you were French....
周期性的局部地区的灾变降低了种群的数量.Periodic local catastrophes reduce populations.最著名的灾变论的对立理论就是渐变论.The most popular alternative to catastrophism is the gradualistic approach.即便当我还是个孩子的时候, 我会做核灾变的噩梦.Even as a kid, I had nightmares of n...