先做一个演示：
^^vjjjjjjjjjjyjjjjjjjjjjjp/adder/d/a/d/b/d/sum/dkkkkkkkkk^^vjjjjjjjjjjyjjjjjjjjjjjp/adder/
阅读背景：
vim高效编辑verilog
来源：互联网
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