Charged particles called ions travel along the nanowire, causing it to stretch out in length and also bend and wiggle.
被称为离子的带电粒子沿着纳米线移动，导致它伸长、弯曲和摆动。
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However, since droplets from a sneeze can travel the length of a double-decker bus, and a cough can infect anyone within about a metre, this is not always possible.
You'll quickly realize whether your shots are under or overexposed and whether the length of the exposure is long enough to let cars travel through the frame in the way that you want.