说明：  用汇编开发的，自动往返小车程序，用红外探头检测轨道，在规定的第二个黑色轨道上加速，然后再下个轨道上减速，再检测轨道，返回原地。
(Developed in assembly, automatic round-trip car program, with the infrared sensor detects the track, the track provided on the second black to accelerate, then slow down the next track, and then test the track, back in situ.)