New Words：

expire [iks'paiə] vi.终止, 期满, 失效
expiration [ˌekspəˈreɪʃn] n.终止, 期满
expiration date n. 有效期

Sample Sentences：

My credit card will expire in June.
When does your driving licence expire?

This ticket has passed its expiration date.
When is the expiration of your driving license?

credit ['kredit] n.信用
reveal [ri'vi:l] vt.显示, 透露, 揭示, 展现
valid ['vælid] adj.有效的, 有根据的, 合法的, 正当的
proof [pru:f] n.证明, 证据

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