The crash had spilled a noxious defoliant into the planet's ecology, ravaging the native flora.这次坠毁将一种有害的落叶剂洒入星球的生态系统中, 破坏着当地的植物群....a senior lecturer in ecology.生态学高级讲师To keep ecology in balance is our duty.保持生态平衡是...
Students all over the country are facing an uncertain future.全国各地学生前途未卜。The sandbank was uncertain, like quicksand under his feet.那个沙坝并不稳固，他脚下如同踩着流沙一般。For a minute he looked uncertain, and then recovered his composure.有一...
Faecal impaction is particularly common in the burned patient.粪块嵌塞特别常见于烧伤病人.These standards relate to the degree of faecal pollution measured as E.这套标准以大肠杆菌(显示污水的存在)量显示粪便带来的污染程度.It boasted 170 times the acceptable level ...