n.填塞物；堵塞物；炮眼封泥
動詞stem的現(xiàn)在分詞形式.
The sap flowed out when he broke the stem of the flower. 他把花莖折斷，汁液就流了出來。
The gardener could graft as many as twenty cuttings an hour on to briar stems. 這位園丁每小時可以嫁接多達(dá)20根枝條到石南莖上去。
