候援投手的英文：
relief pitcher

relief是什么意思：
n. 宽慰；救济；救援物资；免除，减轻，解除；代班人

graduated base relief gradient
分等级的基准宽减梯度

I breathed a sigh of relief.
我安心地松了一口气。

Traveling is a good way of relief.
旅行是一个很好的调剂方式。

No relief drivers were available.
没有换班的司机。

modern methods of pain relief.
现代消除疼痛的方法。

pitcher是什么意思：
n. 大水罐；投手

Whether the pitcher strikes the stone, or the stone the pitcher, it is bad for the pitcher.
不论是水罐敲石头，还是石头敲水罐，都是水罐遭殃。

Walls (or Pitchers) have ears
隔墙有耳

Finally, he found a pitcher.
终于，他找到了一个大水罐。

This season is undoubtedly the best for this pitcher.
这个球季毋庸置疑是这个投手表现最好的一个球季。

The pitcher delivered a curve ball.
投手投掷了一个弧线球。