The delegate promised to continue efforts to reduce by half the number of hungry people by 2050并且解释一下句中第一个by怎么解释

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The delegate promised to continue efforts to reduce by half the number of hungry people by 2050并且解释一下句中第一个by怎么解释

The delegate promised to continue efforts to reduce by half the number of hungry people by 2050并且解释一下句中第一个by怎么解释
The delegate promised to continue efforts to reduce by half the number of hungry people by 2050
并且解释一下句中第一个by怎么解释

The delegate promised to continue efforts to reduce by half the number of hungry people by 2050并且解释一下句中第一个by怎么解释
代表团成员承诺(他们)会继续努力,在2050年之前让遭受饥荒的人数减少一半.
第一个BY的用法就是后面加上一个表示数字的词

翻译: 代表承诺会继续努力,到2050年使饥饿人口数量下降50%。
第一个by表示下降的幅度,即饥饿人口的一半。

代表团承诺,截止到2015年,将世界饥饿人口总数减少一半
by是截止到···的意思