If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果两个等高线相切，说明它们的切线相同，也就是说他们的法向量应该平行，我再在这里画个图。
However, in line with the modest capabilities of the iMic, our target for this series is to work with two parallel (stereo) 44.1khz 16-bit data streams, implying an audio bandwidth of 22.05khz.
然而，为了让iMic具有适度的性能，我们在本系列文章中的目标是处理两个并行的(立体声)44.1 kHz的16位数据流，这就意味着要实现22.05 kHz的音频带宽。
GT roller coaster in Abu Dhabi sends two Ferrari F430 Spider carriages sprinting along twisting parallel tracks on a race to the finish line. [link].
阿布扎比gt过山车使把两辆法拉利f 430蜘蛛放在过山车的并行赛道上比赛谁先到终点。
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