Mercury switches are a little sophisticated for a 12-year-old kid.
水银开关对一个12岁的孩子来说 有些复杂了。
Mercury switches
原声例句
犯罪心理 第1季
英语百科
Mercury switch
A mercury switch (also known as a mercury tilt switch) is a switch which opens and closes an electrical circuit when it is tilted at certain angles. When it is tilted a small amount of the liquid metal mercury makes contact with metal electrodes to close the circuit.
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