羧酸衍生物和亲核酰基取代反应 carboxylic acid derivatives and necleophilic acyl substitution reactions
取代 displace; replace; substitute for; take over; supersede; supplant 国产货正在取代进口货。 home-made goods are edging out imported foreign goods. 他受了伤, 另一个选手取代了他。 he was hurt, and another player replaced him. 许多职员被计算机取代了。 many employees were displaced by computers
Theoretical studies on electronic properties and nonlinear optical properties of bipyridine and their nitrogen substituted derivatives 硝基取代亚酞菁衍生物的电子光谱和非线性光学性质的理论研究