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....
He is making sweeping generalisations to get his point across.为了让大家领会他的观点，他正在作全面的概括。These are sweeping generalisations, of course, but you get the point.切忌以偏概全, 当然, 又得抓住要点.But suicide is a mysterious phenomenon; it defie...
" 他们都说这位老先生在闹痛风呢. ”'say, he's a gouty old boy! "这些天,我的痛风病闹得很厉害.My gout troubles me so much these days.结论中医灸法治疗痛风性关节炎急性期疗效确切.Conclusion Moxibustion therapy is an effective method for acute gouty arthritis....
Why do you wear that ring on first finger?你怎么把那戒指戴在食指上?In Spain, snapping the thumb and first finger a few times is a form of applause.在西班牙, 将拇指和食指放在一起打响指是欢呼的一种形式....