常见例句双语例句Numerous improvements are obtained by employing the amine in molar excess with respect to benzyl halide, preferably in a molar ratio of 2 to 1.通过使用相对于苄基卤为摩尔过量的胺可以得到大量改善， 优选的摩尔比为2至1。ip.com 返回 benzylamine