They were principally used to catalyze aldol, allylation, Diels - Alder, ene and Friedel - Crafts reactions.它们主要被用来催化Aldol, 烯丙基化, Diels-Alder, Ene和 Friedel -Crafts等反应....
他矮壮结实,脖子很粗。He was short and stocky, and had a thick neck.他矮壮的体形总是让他觉得羞愧。He always feels ashamed for his short, stocky figure.这个男孩身体矮壮,生着一张丑陋却讨人喜欢的泰姆纳人的扁阔的面孔.The boy was shot and squat with the broad ugly pleasant face of...