1. insurance n. 保险费; 保险
例句：He surrendered his insurance policy.
他退出保险,获得一笔退保金。

2. afford vt.提供; 买得起; 担负得起
例句：Few could afford the luxury.
很少有人买得起这种奢侈品。

3. decay vt.（使） 腐烂，腐朽
例句：The vibration will decay or damp as a result of the dissipation of energy.
振动因能量耗尽而衰减或阻滞。
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