常見例句雙語例句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.通過使用相對于芐基鹵為摩爾過量的胺可以得到大量改善， 優(yōu)選的摩爾比為2至1。ip.com 返回 benzylamine