词汇讲解：
1. depression n. 经济大萧条，不景气
例句：Business depression usually causes misery among the working class.
商业不景气常使工薪阶层受苦。
2. intervene vi. 干涉，干预
例句：Every sovereign state would intervene in its foreign trade.
每个主权国家都会干预外贸出口业务。
3. dedicate vt. 奉献，把（时间精力）用于…
例句：He dedicated himself to conserving our natural resources.
他把毕生精力用于保护我们的自然资源。
4. treaty n. 条约，协议
例句：They negotiated a treaty .
他们商订了一项条约。
5. aggression n. 挑衅，侵犯，侵略
例句：Aggression by one nationality against another often leads to war.
一个国家对另一国家的挑衅经常会道致战争。
6. concern vt. 有关于，关系到
例句：These problems concern all of us.
这些问题与我们所有的人都有关系。
7. officially adv. 官方地，正式地
例句：They have officially announced their engagement.
他们已正式宣布他们的婚约。
8. diplomatic adj. 外交上的
例句：When the war break out, the two countries break off their diplomatic relation.
战争爆发後，两国间断绝了外交关系。
9. negotiate v. 谈判，协商，达成协议
例句：We've decided to negotiate a loan with them.
我们决定和他们商定贷款之事。
10. neutral adj. 中立的
例句：They maintained a neutral stance.
他们保持中立的姿态。
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