gamma-ray test pit 自然伽马刻度井
The pit organs are highly sensitive to infrared ray and so are called infrared organs.
这种凹陷器官对红外射线非常敏感，因此也称为红外线感受器官。
There are different types of pit-pair between the axial tracheids. the axial tracheid and the ray parenchyma, the axial tracheid and the ray tracheid.
轴向管胞之间、轴向管胞与射线薄壁细胞之间、轴向管胞与射线管胞之间，均有不同类型的纹孔对。
There are different types of pit-pair between the axial tracheids. the axial tracheid and the ray parenchyma , the axial tracheid and the ray tracheid.
轴向管胞之间、轴向管胞与射线薄壁细胞之间、轴向管胞与射线管胞之间，均有不同类型的纹孔对。
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