词汇讲解：
1. unemployment n. 失业
例句：A rapid rise in price soon eventuated in mass unemployment.
物价迅速上涨, 结果造成了大量失业。
2. proposal n. 提议; 建议
例句：They presented concrete proposals for improvement.
他们提出了具体的改进建议。
3. disappointing adj. 令人失望的
例句：The result was disappointing.
结果是令人失望的。
4. acknowledge vt. 承认, 供认
例句：He grudgingly acknowledged having made a mistake.
他勉强承认他做错了。
