以下为句子列表：
英文: As we saw in Figure 11.7, when an HF Signal flows in a PC track running over a ground plane the arrangement functions as a microstrip transmission line and the majority of the return current flows in the ground plane underneath the line.
中文: 如图11.7，高频信号伴行地线传输时，可以将其视为“微带线”，这时大部分返回电流都会从信号线下方的地线流过。
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