【词汇讲解】
1.Commitment n. 承诺，保证; 确定，实行
如：Her commitment to a great cause degenerated from a crusade into an obsession.
她致力於一伟大事业，但其崇高的奋斗精神已变质成为偏执的狂热。
The President affirmed America's commitment to its transatlantic (ie European) allies.
总统申明美国履行对其欧洲盟国承担的义务。
2.let down 放下，降低，使失望
如：The girl let down her hair.
女孩让头发披了下来。
Let down a rope so that I can climb up.
放下绳子，让我爬上去。
3.consequence n. 结果，后果
如：It rained yesterday and in consequence the match was canceled.
昨天下雨了，结果比赛被取消。
It terrified me to contemplate the consequence of your action.
想到你行动的后果，我就感到害怕。
4.impressive adj. 给人深刻印象的
如：The report looks impressive but it's really nothing but waffle.
这篇报告貌似冠冕堂皇，实际上空洞无物。
This aircraft's safety record is an impressive testament to its designers' skill.
这种飞机的飞行安全记录令人印象深刻，证明了该机种设计师本领非凡。