他在梯子上锯苹果树的树冠。

He was up a ladder sawing off the tops of his apple trees.

《柯林斯英汉双解大词典》

研究表明对果树冠层光合影响最大的因子是太阳高度角和果树的冠层结构。

Research proved that the most important factors are the elevation Angle of the sun and the structure of canopy.

youdao

研究表明对果树冠层光合影响最大的因子是太阳高度角和果树的冠层结构。

Research proved that the most important factors are the elevation Angle of the sun and the structure of canopy.

youdao