从电路板上拆除多引脚的通孔元件和大热容量的通孔元件比较麻烦，比如变压器、接插件。
Removed from the circuit board through-hole components via multi pin component and the large heat capacity is quite troublesome, such as transformer, connector.
另外，如果尺寸规则不允许M1/M2的通孔放置在引脚A上，那么布线器就不能很容易的连接上引脚A，这会导致一个低效率的布线设计。
Further, if the spacing rules for this example did not allow M1/M2 vias to be placed on pin A, the router would not be able to connect to Pin A easily.
多少的贯穿孔与引脚比例是最佳的通孔填充？
多少的贯穿孔与引脚比例是最佳的通孔填充？
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