N the outermost coat of a pollen grain or a spore (花粉粒或孢子)外壁 [botany] → compare intine
An extine with its specific pattern had already been formed, when microspores were released from tetrads.
当小孢子从四分体中释放出来，特殊类型的外壁已经形成。
The angle between pinhead and dispensing surface is adjustable, which enables dispensing onto inwall, extine, "L" vertical plane of workpieces.
针头与点胶面可调角度，使胶水能点涂到工件内外壁或“L”型垂直空间内；
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