The skin of amphibians is permeable to water.两栖动物的皮肤是透水的。Most amphibians have caducous gills.大多数两栖类动物都有早落腮.Amphibians live partly in water and partly on land.两栖动物有时生活在水中,有时生活在陆上.Two amphibians ferry them out over the san...
化石燃料（如煤和石油）属于有限资源。The fossil fuels (coal and oil) are finite resources.发电站烧的煤产自鲁尔地区。The power stations burn coal from the Ruhr region.酸雨并非简单地由烧煤造成。Acid rain is not straightforwardly attributable to the burning of coal....
...existentialist theories.存在主义理论The existentialist thinks it very distressing that God does not exist.存在主义者认为这是非常苦恼的,即上帝不存在.Existentialist points of view cause us to reflect and rationally examine existence and its mean...