Asymmetric 1, 3 - dipolar cycloaddition can be strongly catalyzed by chiral oxazaborolidines.手性唑硼烷酮能够催化不对称1, 3偶极加成反应并取得很好的效果.The cycloaddition itself is the slow step.环化作用本身是慢的一步....
The breeze was cool, brisk and invigorating.微风凉爽、清新，令人精神振奋。He found it invigorating to speak of the struggle for realism.一提到为现实主义奋斗,他感到浑身是劲.Such a cool invigorating sky and he had such a broad chest, yet he felt suffocat...
Dorothea felt rather ashamed as she detected herself in these speculations.多萝西娅发现自己这么胡思乱想,不免有些脸红.Your speculations were all quite close to the truth.你的揣测都很接近于事实.This possibility gives rise to interesting speculations.这种可...
I just couldn't take the aggravation.我就是咽不下这口气。Can't stand the aggravation, all day I get aggravation. You know how it is. "我整天都碰到令人发火的事, 你可想而知这是什么滋味. ”Conflict by itself is not horrible, but its aggravation is...