而幼龄瓢虫则可吃掉数百只蚜虫.The young beetle larvae can eat hundreds of aphids.分组后,瓢虫和下拉阴影, 将它放在叶片.After grouping the ladybug and drop shadow, place it on the leaf.不同种类的瓢虫身上斑点数也不尽相同.Different kinds of lady beetles have different numb...
你们收到了多少寄来的贺卡啊！What a lot of cards you've got through the post!伊莎贝尔送给我一张趣味横生的生日贺卡。Isabel gave me a marvellously funny birthday card.我刚把她的生日贺卡拿去邮局寄.I've just taken her birthday card down to the post....
Ozone is a highly reactive form of oxygen gas.臭氧是一种非常活跃的氧气形态。Ozone is produced by the reaction between oxygen and ultra-violet light.臭氧由氧气和紫外线发生反应而产生。Every spring the ozone is chewed up, and the hole appears.每年春天，臭氧遭到破坏，...
Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization.烯酮, 特别是二甲基烯酮, 很容易齐聚和聚合.A notably short, silver-haired man, he plays basketball with his staff several times a week.他个子明显较为矮小，一头银发，每周都会和...