(No difference)
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If you want, you can also place the serial converter so that the pins and jumper cables go in between the rows of pins on the Teensy. It's a very snug fit though so you should use some electrical tape to insulate the pins on the serial converter because they will touch the Teensy ones if you don't.
无所谓，线可以缠在多余的针之间，还能减少短路的可能性。
