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1.prevent from 阻止
To prevent and investigate illegal activities; to attack and take precautions against terrorism; to maintain the public order and prevent from activities against public order.
预防、制止和侦查违法犯罪活动；防范、打击恐怖活动；维护社会治安秩序，制止危害社会治安秩序的行为；
2.look after 照顾
It's her duty to look after her aunt.
照顾她姨妈是她分内的事。
3.go missing 丢失
Examples abound of databases being stolen: disks full of social-security data go missing, laptops loaded with tax records are left in taxis, credit-card numbers are stolen from online retailers.
例如，大量数据库被盗；装满社会保险数据的光盘不见了。 载有税务记录的笔记本电脑被遗忘在出租车上，信用卡号在线使用时被盗。
4.be vigilant with 警惕
Therefore, we should keep sober mind and be vigilant with the false or invalid dialogue despite of the vigorous appearance.
因此在轰轰烈烈的对话之时，我们要保持一种清醒的头脑，警惕教学中的“假对话”、无效对话。
