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 ...
Patsy had to clench her jaw to suppress her anger.帕奇只得咬紧牙关压住怒气。Patsy could hardly be heard above the baby's yowls.在婴儿的号哭声中很难听清帕齐在说些什么。"Now watch it, Patsy," the Sergeant told her.“留点神,帕齐。”中士提醒她。...