xylem rays造句

例句与造句

1. thickness of upper and lower epidermis of leaves, width of xylem and phloem of annual and biennial branches, ratio of late wood to early wood, periderm thickness of biennial branches, and length of xylem ray present decreasing trends with latitude ascending; while ratio of palisade tissue to spongy tissue, epidermis thickness of annual branches, and cortex thickness of biennial branches show unobvious variations with latitude increasing
   叶的上下表皮厚度、1和2年生枝木质部及韧皮部宽度、晚材早材比值、2年生枝的周皮厚度、木射线长等均随纬度升高而呈下降趋势；而叶的栅栏组织和海绵组织比值、1年生枝表皮厚度、2年生皮层厚度等解剖结构随纬度变化没有明显规律。
2. It's difficult to find xylem rays in a sentence. 用xylem rays造句挺难的