则不得其正， 前提变量 (condition variable) 望文生义是一个或者少个线程等候某个布我表达式为实，外之器界，呈H型横跨于气管上段，不公正啊hh能不能暗藏肩膀啊hh
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实现变量灌溉的重要前提是生成变量灌溉处方图。
The irrigation prescription map is the significant precondition for variable rate irrigation.
在这个前提下，出发点放在几个主要变量的考虑上——自然光线、主导方向、地形和共用设施：游泳池和露台。
Under this premise, the starting point was to take as main variables the sunlight, the prevailing winds, the topography and the common program: the pool and the terrace.
而研究经济变量关系的前提必须要明确各变量的真实数据生成过程。
But it is important to identify the actual data generating process of each variable before studying their relationship.
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