1.keep an eye on 照看； 照管； 留心； 注意

Can you keep an eye on things for the next few days?
以后的几天，你可以帮我照看一下吗？

Smart homes could keep an eye on elderly people and allow them to be more independent.
智能型家庭可以照看老年人，并且让他们更加的独立一些。

2.send out 发送； 发出；长出

Let's send out some invites and see who shows up.
让我们发出邀请看谁能够崭露头角。

Once service was restored, the regime used the network to send out propaganda messages.
沃达丰的服务曾一度恢复，但埃及政府随即借助该网络发送宣传消息。

3.rely on 信赖； 依赖；依靠

We rely on corporations like bp to bring us energy.
我们依靠像bp这样的公司来供给我们能源。

The firm cannot rely on reputation forever.
公司不可能永远依赖其名声。

4.back by 回来的

The first concert was put back by six days.
第一场演唱会曾被推迟了六天。

But earlier this month the timetable was pushed back by at least three months, to early 2013.
但本月早些时候其上市时间至少被后推三个月，至2013年初。