... hollow pile 空心桩 hollow pith 髓腔 hollow plywood 空心胶合板 ...
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hollow arbor pith 髓腔
But outer pith cell of hollow center potato was bigger than that of normal one, and the cell wall was thicker. But the wall of pith cell was thiner than that of normal one.
空心块茎环髓区细胞壁厚度比健康块茎的厚，而心髓区细胞壁厚度则比健康块茎的薄；
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