Butter, margarine, and oily fish are all good sources of vitamin D.黄油、人造黄油和多脂鱼都含有丰富的维生素D。You can buy a formulation containing royal jelly, pollen and vitamin C.可以买一种含蜂王浆、花粉和维生素C的配方产品。Liver and kidney are particularly ric...
蚯蚓做了使土壤透气的重要工作。Earthworms do the important job of aerating the soil.蚯蚓钻土很深。Earthworms burrow deep into the soil.他们正在挖蚯蚓作鱼饵.They were digging up worms to use for bait....
...the protection of mankind against the forces of nature: epidemics, predators, floods, hurricanes...保护人类抵御自然力——传染病、食肉动物、洪水和飓风During the annual floods the river deposits its silt on the fields.每年河水泛滥时都会在田野上沉积一层淤泥.Foreca...