名词
中文翻译：方向效应
同义词：
['directional influence', 'directional impact']
例句：
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1.The study found that the directional effect of the policy on employment was significant.
研究发现，这项政策对就业的方向效应是显著的。
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2. In this experiment, we observed a directional effect on the growth rate of the plants.
在这个实验中，我们观察到了植物生长率的方向效应。
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3. The researcher suggested that the directional effect could be due to the differences in the environmental conditions between the two sites.
研究者建议，这种方向效应可能是由于两个地点之间的环境条件差异造成的。