We shall start the block from rest at the center point of the track and force them apart by exploding the cap with an electric spark . 开始时，将两个滑块静止置放在槽的中心，然后利用电火花引爆雷管，迫使它们分开。
2.
We shall start the blocks from rest at the center point of the track and force them apart by exploding the cap with an electric spark . 开始时，将两个滑块静止置放在槽的中心，然后利用电火花引爆雷管，迫使它们分开。
3.
We shall start the two blocks from rest at the center point of the track and force them apart by exploding the cap with an electric spark . 开始时，将两个滑块静止置放在槽的中心，然后利用电火花引爆雷管，迫使它们分开。
