间隔300ms第一次一个管亮，第二次两个管亮，依次到8个管亮，之后，第一次最后一个管亮，第二次倒数两个管亮，然后重复整个过程。注意<<与——_crol_的却别！-300ms interval of a first light pipe, the second two tube-liang, followed by the 8 tube light, after the first possession of the last light, the second countdown to two tube light, and then repeat the whole process. Note < < and- _crol_ but do not!