1. exchange vt.交换，互换
例句：You may exchange the shoes but not return them for a refund.
你可调换这双鞋,但不能退货。

2. launch vt.发射
例句：She would be able to launch seaplanes by using light jettisonable trolleys.
它能用轻便的抛射推车发射水上飞机。

3. post vt.张贴; 宣布; 设岗; 邮寄
例句：I must post this letter; it's urgent.
我必须发了这封信，信很紧急。

4. appear vi.发表; 出现
例句：This may appear complex, so we shall explain it step by step.
它似乎很复杂，因此我们将逐步地加以说明。

5. explosion n.爆发; 爆炸
例句：The population explosion is accompanied by a population implosion.
人口爆炸还伴随着人口爆聚。
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