Williamson reaction is one important method to prepare unsymmetric ether.Williamson反应是制备不对称醚类化合物的重要方法.Brydon's team-mate Martin Williamson consolidated his lead in the National League when he won the latest round.布赖...
Whistler, as always, was merciless.和以往一样，惠斯勒还是那么冷酷无情。Look at this. A ski trip to Whistler. Whistler is a famous ski resort.看这张海报, 去惠斯勒滑雪旅游,惠斯勒可是个有名的滑雪胜地.Whistler is very safe and easy to get around in.惠斯勒是个非常安全的地方,可以轻松地四...
The camera combines rugged reliability with unequalled optical performance and speed.这款相机既坚固耐用，又有超凡的光学性能和快门速度。Here another rugged castle crowns the cliffs and crags.这里又有一座高低不平的城堡建在悬崖绝壁之上。an actor famous for his rugged go...
学生参加重考的次数将受到限制。Limits will be placed on the number of exam retakes students can sit.他坚持要求老师重考.He persisted in asking his teacher to retake the test....