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...
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...
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...
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 ...
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...