Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover with hollow inside.

它是个上端为钻杆母扣或者由壬，下端为套管公扣，内空心的转换接头。

youdao

The upper blade is connected with the lower blade through a pin shaft and a chute.

上叶片与下叶片通过销轴和滑槽连接。

youdao

The base is connected to a 10K ohm reistor which is connected to the serial data output pin of your microcontroller (ours is pin 1 aka TX aka the pin on the upper left).

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To access that slot (located on the phone's upper right edge), however, you'll need one of those pin keys -- the same goes for the SIM slot on the top right.

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