高中英语（中译英）——要手工的
问题描述：
高中英语（中译英）——要手工的
13.为了安全的缘故,我安装了警报系统.(sake)
14.请你确信是锁上门后才离开的.(make sure)
15.开始时,*很难说服人们离开家乡去上海落户.（have difficulty in）
答
1.For the sake of security,I have installed alert system.2.Please make sure the door is closed before you leave.3.In the beginning,the government has difficulities in persuading people to leave their ...