... 筛管sieve tube 筛管分子sieve elements 筛孔slotted hole ...
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mature sieve elements 成熟筛管成分
Metaphloem Sieve Elements 后生韧皮部筛分子
The tracheid and sieve tube elements are all differentiated from the procambia in the center of the haustoria, and the former occurs prior to the latter.
吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的，管胞的分化先于筛管，或同时进行。
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