Perpendicular with the root of the wire, the direction sensor can be made.
用了根相互垂直的丝，可以制成方向传感器。
Adjust the direction of wire ring to keep the toy face in front.
可以调节方向金属挂圈，令配戴时玩具的正面向前方。
This is because the direct current flows in a wire always in one direction.
这是由于直流电在导线内总是沿着一个方向流动。
This is because the direct current flows in a wire always in one direction.
这是由于直流电在导线内总是沿着一个方向流动。
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