在任何时候尝试稳步注视中央向下计数器。
At all times try to steadily fixate the central down-counter.
你的任务是看中央向下计数数字和你内心深处的眼睛(！)
Your task is to look at the central down-counting digit and with your inner eye !
的变化，反映在时序安排的40103向下计数器，必须喂以较低利率计数时钟，这并不影响产出率的PWM波的列车。
The change is reflected in the clocking arrangements of the 40103 down-counter, that must be fed with a lower rate counting clock.
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