我们考虑了一对红球蓝球发现黄球并定位的问题，在此基础上进行扩展，基本解决了黄球的发现并定位的问题。
Under the basic work of how to find and locate the yellow ball with a couple of red ball and blue ball, we solve the problem.
在黄泛沙地上进行毛白杨不同整地规格造林试验。
Poplar afforestation test with various soil preparation specifications was carried out in the sandy area of the Yellow River.
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