A photocell is provided to detect the rejected bags .

光电池可以用来发现被拒绝的袋。

We must use photocell as detectors .

我们必须用光电管作为探测器。

Measuring methods of photocell - rise time and fall time .

光电池测量方法上升时间,下降时间。

The registers and players all use some kind of photocell , but what is more interesting from an einsteinian perspective is the red beam of coherent light they shoot .

结帐柜及随身听都用到某种型式的光电池，但是从爱因斯坦的观点来看，更有趣的是它们所射出来的红色同调光束。