门式刚架的中柱设计中，常因为平面外计算长度较大，所选实腹式截面无法满足平面外稳定验算，从而导致用钢量增加。
In the mid-column design of gabled frames, the selected solid web section, isn t satisfied by in-plane stability checking because of the biggish out-plane effective length.
在子叶节区下部存在原始的外始式二原型十字形单中柱。
The primitive exarch and diarch haplostele with cross-like metaxylem exists in the lower part of CNZ.
中柱最前端可较早地分化出中柱的最外一层中柱鞘。
The anterior portion of the stele differentiated rather early into an outer layer-pericycle.
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