如果只有一种脉冲——两种的其中一种——与硅条产生共振，硅条只能停留于振动的状态。

If just one of the pulses - or neither of them - resonates with the strip then it remains in its existing vibrational state.

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在合适的电压下，硅条会进入一种滞后状态——硅会以两种振幅振动。

With the right voltage, the strip will enter a so-called hysteretic regime - where it will vibrate with one of two amplitudes.

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一切都保持静止时笔将画出一条直线，而当圆筒被振动时，笔画出的线就会蜿蜒起伏。

As long as all was still the pen drew a straight line but while the drum was being shaken the line that the pen was drawing wriggled from side to side.

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