pith是什么意思

双语用例

• In the central zone of the embryonic axis, the pith contained large cells and cytoplasm of low density.

• Close to the pith border, these cells tend to be radially elongated in transverse section.

• The innermost part cor responds to a zone close to the pith which is not preserved.

• The pith is the most voluminous portion of the petiole and consists of soft, spongy parenchyma.

• A thin cortex layer covers the thicker fibrous tissue which surrounds the inner pith.

• The stems are usually hollow due to the presence of ant colonies that remove the pith.

• The pith and substance of these policies is that alcoholic beverages are not like any other commodities, and must therefore be subjected to a distinct set of commercial principles.

• Pith was encountered in 57% of the samples.