simple perforation meaning in English
单穿孔
单一穿孔 多数树种属之，即导管节先端只有一个穿孔而完全开口者，在完成开口之后尚会保留穿孔板之痕迹称之为穿孔环
Examples
- The result shows that there are various patterns of vessel elements and three types of perforation plates : both ends of the vessel element are simple perforation plate ; one end with simple perforation , the other with two simple perforations ; one end with two simple perforations , the other with three simple perforations
在荔枝的次生木质部中导管分子存在着多种的样式，并且导管分子穿孔板存在着3种类型：两端均为一个单穿孔板；一端一个单穿孔板另一端两个单穿孔板；一端两个单穿孔板另一端三个单穿孔板。 - It was shown that vessel elements in secondary xylem of p . emblica have many different forms and most of them have tails and their perforation plates divide into two types : ( 1 ) there is one simple perforation plate at each end of the vessel elements and ( 2 ) there is one simple perforation plate at one end of the vessel elements and two simple perforation plate at the other end ; ( 3 ) a few vessel elements have special inclusions ; ( 4 ) the intervascular pits are alternate pits ; ( 5 ) the pits between the vessels and rays are mixed pits , pits with transverse gashes and scalariform pits
结果发现，余甘子次生木质部导管分子中存在着许多不同的样式，导管分子大多数具尾；其穿孔板存在着两种类型： ( 1 )两端均为1个单穿孔板； ( 2 )一端为1个单穿孔板;另一端为2个单穿孔板； ( 3 )极少数的导管分子具有特殊的内含物； ( 4 )管间纹孔式为互列纹孔式； ( 5 )导管射线间纹孔式为混合型纹孔与横列刻痕状纹孔以及梯状穿孔。