The recent outbreaks of cholera are a timely reminder that this disease is still a serious health hazard...最近霍乱的爆发及时提醒了人们该疾病仍然会严重危害健康。The recent outbreaks of cholera are a timely reminder that this disease is still a ser...
Each ecosystem, however, is continuous to some degree with adjacent systems.然而, 每个生态系统在某种程度上都和邻近的系统是连续的.Thus, noncontinuous emission limitations were appropriate only when continuous controls were infeasible.因此, 非持续性排放限制...