Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using stannous chloride as catalyst.以非质子...
分为四个不同的类群: 苏铁类 、 银杏类 、 松柏类、买麻藤类植物以及一些化石类群.There are four widely different living groups: the cycads , ginkgo, conifers , gnetophytes, and several fossil groups....
他跌倒时,前颚撞在了道路的边石上.He hit his forehead against kerb when he fell.而且他的面孔光润, 颚骨下陷.And then his face was smooth , with a receding jaw.牙痛使我整个颚都痛起来了.A too thacke racked my jaw....
人参以其滋补功效而广为人知。Ginseng is generally known for its tonic properties.如果这笔庞大的拨款立即派上用场,对当时的经济可能起滋补作用.The effect might have been invigorating had this huge sum been poured immediately into the economy.该酒酒精度低,营养丰富, 具有饮用滋补双重作用.T...
Nelson Piquet, three times world champion, was grievously injured.三度获得世界冠军的尼尔森·皮奎特受了重伤。Birds, sea-life and the coastline all suffered grievously.鸟类、海洋生物及沿海生物均受到严重影响。The Irish and Bristol Channels were closed or grievousl...
你可以看到他们脸上的彩虹色。You can see the iridescence on their faces.黑色素翅膀和彩虹色翅膀的代价与上面却完全不同.The costs of melanin - based plumage and iridescence are clearly different from this.因为在我的电脑显出是彩虹色的, 很多彩的色泽.Because in my computer the line ...