The output can be more specific than just specifying the analog pin number, but the generic number allows flexibility because it does not tie down any one pin to any one job.

输出也可能比仅指定模拟管脚编号更为具体，但是本机编号灵活性更好，因为它不会将任何一个管脚束缚到某一项作业上。

youdao

One of the basic rules is that you don't do anything an animal doesn't want to do and you can't tie an animal down.

最基本的原则之一是你不能强迫动物做它们不愿做的事情，也不能束缚动物。

youdao

If you tie yourself down with one thing, you will not get on with your life.

如果你把自己和一件事情拴在一起，那就无法继续你的生活了。

youdao

Sixth seed Pliskova, 18, came back from 4-1 down in the tie-break to seal victory in one hour 20 minutes.

BBC: Brit Laura Robson suffers Australian Open final defeat

The wait for the opening goal to level up the tie was not a long one, however, as a spirited Ronaldo surged down the left flank and surprised Lloris with a first time left-footed shot that went through the keeper's legs, his seventh goal in six Champions League matches this season.

BBC: Real Madrid 1-1 Lyon (agg 1-2)

However, Serena's serve improved gradually and having recovered from 3-1 down to take the second set tie-break, the world number one eventually overpowered her 20-year-old opponent.

BBC: Serena Williams to face Li Na in Australian Open semis