词典释义：
a device for making and breaking the connection in an electric circuit
开关
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the guard hit a switch and the gate swung open .守卫按了一下开关，大门就打开了。
【计 算机】 切换。
an act of adopting one policy or way of life, or choosing one type of item, in place of another; a change, especially a radical one
（政策，生活方式，挑选物品类型的）转变（尤指根本的改变）
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his friends were surprised at his switch from newspaper owner to farmer .他的朋友对他由一个报纸业主转而成为农民感到吃惊。
a slender flexible shoot cut from a tree
（树上砍下的）细软枝条。
〈北美〉 （铁道的）道岔。
a tress of false or detached hair tied at one end, used in hairdressing to supplement natural hair
假发。
change the position, direction, or focus of
改变（立场，方向，焦点）
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the company switched the boats to other routes .该公司把船调到了别的航线上。
adopt (something different) in place of something else; change
替换，改变，转变
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she's managed to switch careers .她设法变换了职业。
[no obj.]adopt a new policy, position, way of life, etc.
转换（新政策，立场，生活方式等）
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she worked as a librarian and then switched to journalism .她先是做图书管理员，然后改行到新闻界工作。
substitute (two items) for each other; exchange
调换；交换
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after ten minutes, listener and speaker switch roles .十分钟以后，听话者和说话者调换角色。
〈古〉 （用枝条）击打；轻拂。
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switch something off turn off an electrical device 关上电器 -
（
switch off ）informal cease to pay attention 〈非 正式〉 不再注意as he waffles on, I switch off . 当他开始絮叨时，我就不再听了 -
switch something on turn on an electrical device 打开电器
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switch to/into sth 转换到某物
真题例句：
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switch over (from … to …) （从…）转换到
真题例句：
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switch sth on/off = switch on/off sth 打开.../关闭...
真题例句：
" late 16th cent. （denoting a thin tapering riding whip）： probably from Low German. "
