The necessary material of 2 - ( 2 - methoethyl ) acetaldehyde diethyl acetal was synthesized in addition.另外还合成了必需原料 2- ( 2- 甲氧基乙氧基 ) 乙醛二乙醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using stannous chloride...
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...
记住：保持乐观的心态，好事自然会发生。Remember, keep a positive attitude and good things will happen.你必须全力以赴，最大限度地去努力。如果你这么做，并且保持乐观，你就会看见乌云背后的幸福线。You have to do everything you can. You have to work your hardest. And if you do, if you stay ...
这个年老的流浪汉疲惫不堪,蹒跚地走上了小路.The old tramp shambled wearily up the path.但是年老有年老的好处.On the other'and, there's great advantages in being a old man.陈姨太也回到了她的年老的母亲那里.His concubine , Mistress Chen, was visiting with her ol...
I was floored by his argument and had to admit defeat.我被他驳倒了, 只得承认失败。He was floored by the announcement...这个通告使他不知所措。He was floored by the announcement.这个通告使他不知所措。The soldier floored his attacker with one heavy blow.士兵重重...
She always talks in such a genteel voice when she’s on the phone.她打电话时, 说话总是摆出一副上流架子。Her genteel accent irritated me.她那矫揉造作的腔调使我感到难受。She always talks in such a genteel voice when she's on the phone.她打电话时,说话总是摆出一副上流架...