突然一道闪电划破长空。Suddenly a bolt of lightning crackled through the sky.理查德和托尼在圣诞夜一道露面了。Richard had turned up on Christmas Eve with Tony.饭菜的安排至关重要。每一顿饭的每一道菜都应该有所不同。The menu is all-important. Every component of every meal should...
We are aware of the potential problems and have taken every precaution.我们已意识到潜在的问题，并采取了全面的预防措施。I took the precaution of clearing out my desk before I left.我临走时特地事先把办公桌清理了一下。I took the precaution of locking money in the s...
It represents an example of a heterocycle being formed as transient species.它仍然是在反应中生成过渡状态的杂环的实例.The reduced heterocycle 46 conveniently separates out during the reaction.在反应过程中被还原的杂环(46)可以方便地分离出来....