1. Is aggression an essential part of the human psyche?
    损人利己是否是人心灵的主宰?

2. Frankly, I'm proud. I'm doing an essential task. I left this country a little cleaner than I found it this morning. Not many people can say that tonight.
    说实话，我感到骄傲，我在做一项必不可少的工作。每晚工作结束时，我发现这个国家比早上更干净了。并不是每个人当晚都能这样说的。

3. Financial experts say that Euro Disneyland, the first phase of which is costing an estimated $3.6 billion, is essential to Disney's overall fortunes, which have been hit by competition and declining attendance in the United States.
    欧洲迪斯尼乐园的第一期工程预计将花费36亿美元，财政专家说这一项目对迪斯尼的总体财富非常重要。迪斯尼在美国已遭遇到了竞争，游客量正在下降。