on a stem的用法和樣例：
例句
- The point on a stem where a leaf is attached or has been attached; a joint.
節(莖上生葉處)莖上的點(diǎn)，此處長(cháng)葉或有葉子; 節點(diǎn) - The arrangement of leaves on a stem.
葉序莖上葉子的排列次序 - A small protuberance on a stem or branch, sometimes enclosed in protective scales and containing an undeveloped shoot, leaf, or flower.
芽，萌芽莖或枝上小的隆起物，有時(shí)被包在保護性的介殼中，內中有未發(fā)育的根、葉子或花
