腺毛密度年际间比较稳定，受基因影响大。
The density of trichome was stable in two years, and largely determined by genes.
年际间气象条件（特别是降雨）的差异性导致了水量平衡的差异性。
The annual fluctuation of the weather conditions, especially the rainfall, resulted in the fluctutation of the water budget.
年降水量变异系数随海拔的升高而减小，即海拔越高的区域降水量的年际间波动相对越小。
Annual precipitation variation coefficient was smaller in higher altitude mountain than in lower altitude areas and plain in Urumqi river basin.
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