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)44.1kHz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。
The Earth is round, but we walk actually on the parallel line which two cannot intersect cannot surmount.
地球是圆的，而我们却偏偏走在两条不能相交也不能跨越的平行线上。
The long line transmission technology of two-way parallel interface bus of monolithic compnters is analysed and discussed. Solutions are given, which have high value in engineering applications.
本文针对单片机双向并行接口总线的长线传输技术进行了分析和讨论，并给出了解决方案，具有较高的工程实用价值。
The long line transmission technology of two-way parallel interface bus of photoelectric equipment is analysed and discussed, and solutions are given.
针对大型光电项目中并行数据总线长线传输问题，分析了存在问题并给出解决方案。
With these settings the two types of maps were parallel and they were also in-line with the Z-axis of the object.
使用这些参数设置，两种类型的纹理就平行了，同时纹理也和物体的Z方向一致。
When installing at least two quartz lamps, the at least two quartz lamps are equipped symmetrically to the vertical central line of the cup body and connected in series or parallel.
当至少安装两盏石英灯时，所述至少两盏石英灯以杯体的上下中 心线为对称轴对称安装；
Can stand finally at two parallel on-line mutual on guard never once cross however!
最后只能站在两条平行线上互相守望却从不曾交错！
The utility model can be driven to move along straight line by two parallel guide rods which are fixed on the bedplate.
藉台板上固设之二平行导杆，可使工具作直线导引作动。
The utility model can be driven to move along straight line by two parallel guide rods which are fixed on the bedplate.
藉台板上固设之二平行导杆，可使工具作直线导引作动。
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