feedback counter的用法和樣例：
例句
- The maximum count of a combination counter is thus a function of the number of stages of the binary and feedback counters.
組合計數器的最大數值是二進位計數器和反饋計數器的級數的函數。 - It should be noted that at the beginning of their operation the feedback counters must be cleared.
我們必須注意，反饋計數器在開始工作前，必須首先清除。
