重点讲解：
1. a combination of
结合；联合；混合；
eg. Their method of negotiating is a combination of the carrot and the stick.
他们谈判的方法是软硬兼施。
eg. A combination of these two tricks makes for some interesting effects.
这两种戏法的结合会产生一些有趣的效果。
2. at the same time
同时；然而；不过；
eg. She was somehow able to look sad and cheerful at the same time.
她能够做出又悲又喜的神情。
eg. I don't think I set out to come up with a different sound for each album. At the same time, I do have a sense of what is right for the moment.
我不觉得我一开始就特意为每张专辑设定了不同的曲风。然而，我确实知道当时想要的是什么感觉。
3. triumph over
战胜；克服；
eg. The whole world looked to her as a symbol of good triumphing over evil.
全世界都把她视为正义战胜邪恶的象征。
eg. She was confident that she would ultimately triumph over adversity.
她相信自己最终能战胜逆境。
