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.
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。
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.
这种完井井下工具解决方案可被用于砾石充填或挤压充填完井，也可以用于其它任何需要两次下钻才能下入的完井方式，包括优质筛管完井等。
This complete downhole tool solution can be used in gravel or frac pack applications as well as any two-trip configuration, such as standalone screen type completions.
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