The new drug lessens the severity of pneumonia episodes.新药减轻了肺炎发作时的痛苦。Polluted water lessens crop yields.受污染的水源会降低农作物产量。Alcohol lessens resistance to diseases.含有酒精的饮料会减弱对疾病的抵抗力.Great alm _ giving , lessens no man's ...
必须对这些鸟称重，辨识雌雄并挂上标牌。The birds must be weighed, sexed and tagged.你怎样辨别一条鱼的雌雄？How can you tell what sex a fish is?鸟的雌雄通常可就其颜色予以区分.Coloring differentiates the sexes in many birds....
Eczema is a common skin complaint which often runs in families.湿疹是一种常见的皮肤病，通常具遗传性。A gold mine is not a bottomless pit, the gold runs out.金矿并非无底的宝藏，金子终究会被采光。Their defense markets are too small to sustain economically viab...