seal的过去式和用法例句

　　seal做动词有密封;盖印;明确等意思，那么你知道seal的过去式是什么吗?下面是学习啦小编整理的seal的过去式和用法例句，希望对大家的学习有所帮助!

　　seal的过去式和其他时态：

　　过去式: sealed

　　过去分词: sealed

　　现在分词: sealing

　　seal的用法：

　　seal的用法1：seal用作名词时的意思是“印章”,转化为动词的意思是“盖章于…上”,引申可表示“封”“封口”“封住”“最后确定”等。

　　seal的用法2：seal只用作及物动词,接名词、代词作宾语。

　　seal的过去式例句：

　　1. The areas are sealed off and ringed by troops.

　　这些地区被军队封锁包围了。

　　2. Helicopters with searchlights swept the park which was sealed off.

　　直升飞机的探照灯来回扫射这个被封锁的公园。

　　3. Police and troops sealed off the area after the attack.

　　袭击发生后警察和士兵将该区域封锁。

　　4. A heavily armed guard of police have sealed off the city centre.

　　一队全副武装的警察已经封锁了市中心。

　　5. Make sure that your tiles are thoroughly grouted and sealed.

　　要确保这些瓷砖经过彻底灌浆并且密封好。

　　6. A courier was despatched with two sealed envelopes.

　　信使受命递送两封封讫的信。

　　7. The milk was sterilized and sealed in bottles.

　　牛奶经过灭菌处理后被封装在瓶子里。

　　8. Windows are usually sealed off.

　　窗户通常是封闭的。

　　9. The floor is sealed to prevent water penetration.

　　地板加了密封涂料防止渗水。

　　10. We will never forget the friendship sealed in adversity.

　　患难之交永不忘.

　　11. The country sealed its borders to prevent the influx of illegal immigrants.

　　为了防止非法移民大量湧入,该国封闭了边境.

　　12. We sealed our agreement by shaking hands.

　　我们最后以握手表示达成了协议.

　　13. She sealed the letter.

　　她把信封上了.

　　14. The arrival of reinforcements sealed our victory.

　　增援部队的到来决定了我们的胜利.

　　15. The friendship sealed in adversity is the sincerest.

　　患难中结成的友谊最真挚.