全部

1·It is bounded above by a road that overhang it and below by a path.

该地以一条公路为界，公路悬于该地之上，通过一条小路下来。

2·These steps are bounded—the value won't go above the upper limit set by the program or below the lower limit.

每一步都是有界的，数值不会超过程序设置的最上限，也不会低于程序设定的最下限。