In the above diagram, the single-wire section between the two hollow cones can be as long as desired, but it must be fairly straight.
在上面的图中，两个空心锥单线之间的一段，可只要需要，但它必须是相当直。
In the above diagram, the single-wire section between the two hollow cones can be as long as desired, but it must be fairly straight.
在上面的图中，两个空心锥单线之间的一段，可只要需要，但它必须是相当直。
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