The safe yield of a ground water reservoir was defined by meinzer(1920)as "the practicable rate of withdrawing water from it perennially for human use. " 地下水库的安全开采量，据迈因策（1920）所下的定义为：“供人们长期使用的实际可能的开采水量。”
2.
Wheat stripe rust became the most important disease to threaten wheat ' s safe yield in sichuan province 摘要小麦条锈病已成为威胁四川省小麦安全生产最重要的病害。
3.
The safe yield of a ground water reservoir was defined by meinzer ( 1920 ) as " the practicable rate of withdrawing water from it perennially for human use . 地下水库的安全开采量，据迈因策（ 1920 ）所下的定义为： “供人们长期使用的实际可能的开采水量。 ”
