程序集中是
// 当一个数字是其他两个数字的中间值时，会将其舍入为两个值中绝对值较小的值。
AwayFromZero = 1
微软官网注释是
| AwayFromZero | 1 |
Round to nearest mode: when a number is halfway between two others, it is rounded toward the nearest number that is away from zero. |
英文的意思我觉着，是距离【一个离零最远的数】最近的一个数。这个英文表达和中文翻译有点意思。