A：Do you have a free moment?
      你有空吗？

B：Sure. What do you need?
      有空。怎么了？

A：I’m having some trouble. How do you use this printer?
      我碰到一些麻烦。这个打印机怎么用？

B：Well, first you have to turn this switch on.
      哦，首先你把这个开关打开。

A：Silly me.
      我真蠢。

B：Now press this button.
      然后按这个按钮。

A：Oh, and it’s out of paper. Do you have any more?
      哦，没纸了。你还有吗？

switch的解释

B：Just a second. I’ll go get some.
      稍等一下。我去拿一些过来。

1. (电路的)开关，闸，转换器
    A switch is a small control for an electrical device which you use to turn the device on or off.

    e.g. Leona put some detergent into the dishwasher, shut the door and pressed the switch.
           利昂娜将一些清洁剂放入洗碗机，关上门后按了开始键。
    e.g. ...a light switch.
           电灯开关

2. 转换;改变;转变
    If you switch to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.

    e.g. Estonia is switching to a market economy...
           爱沙尼亚正在向市场经济转轨。
    e.g. The law would encourage companies to switch from coal to cleaner fuels...
           该法律将鼓励企业转而使用比煤更加清洁的能源。

3. 转移(注意力);(注意力)转变
    If you switch your attention from one thing to another or if your attention switches, you stop paying attention to the first thing and start paying attention to the second.

    e.g. My mother's interest had switched to my health...
           母亲转而关注起我的健康来。
    e.g. As the era wore on, she switched her attention to films.
           随着这个时代慢慢过去，她把目光投向了电影业。

4. 交换;调换;对调
    If you switch two things, you replace one with the other.

    e.g. In half an hour, they'd switched the tags on every cable...
           半个小时内，他们就给每根电缆都换了标签。
    e.g. The ballot boxes have been switched.
           投票箱被人调换了。

相关词组：switch offswitch onswitch over