亲电子取代 electrophilic substitution
离子取代 ion substitution
供电子取代基 electron donating group
吸电子取代基 electron with-drawing group
离子取代凝胶 Ion replacement gels
拉电子取代基 electron-withdrawing substituent
单分子取代 unimolecular substitution
类阳离子取代 cationoid substitution
给/吸电子取代基 Donor/acceptor substituents
原子取代 atomic substitution
上月中国表示，希望最终看到美元的主要全球储备货币地位，被一篮子重要的货币和大宗商品取代。
Last month, China said it hoped eventually to see the US dollar replaced as the main global reserve currency by a basket of significant currencies and commodities.
当然，自然粒子加速器也不能取代人造加速器。 有很多实验仍然只能利用大型强子对撞机（LHC）这样的人造加速器来进行。
However, natural particle acclerators certainly can't replace man-made ones, as there are many experiments that can still only be carried out in a man-made accelerator like the LHC.
欧洲刚刚完成修复的大型强子对撞机正式取代美国的正反质子对撞机成为世界最大的粒子加速器。
The Large Hadron Collider, Europe's newly repaired particle accelerator, officially overtook America's Tevatron as the world's most powerful.
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