写它们也只占用一小部分时间。
只要花一小部分时间，就可以节省更大部分的时间。
By investing a little time upfront, large time savings can be achieved.
用户会把一小部分时间浪费在浏览无用的按钮和决定哪一个才是该点的上面。
Some small amount of wasted time is spent scanning the useless button and deciding which of the two buttons is the correct one.
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