伴胞为与筛管分子等长的一列或单个细胞。
Companion cells arrange in a row or single cell as long as the sieve tube member.
韧皮部中筛管分子的端壁是由4—6个梯状排列的筛域组成的复筛板。
The end walls of sieve-tube elements in the phloem have 4-6 specialized sieve areas which together form compound sieve plates.
韧皮部中筛管分子的端壁是由4—6个梯状排列的筛域组成的复筛板。
The end walls of sieve-tube elements in the phloem have 4-6 specialized sieve areas which together form compound sieve plates.
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