water act水法watern.水；海域；雨水；海水v.给 ... 浇水；给 ... 供水；加水稀释；充满眼泪；给...水喝water and soil image community水土意象群water supply and drainage pipe给水排水管道Water - purification factory净水厂water intake of dressing works选矿取水water-stable soil aggregates水稳性团聚体water quality of river network河网水质water-pipe valve of plastics塑料水管阀water-conservation equipment节水器具water environmental management水环境管理water conservation performance保水性能

1. In nonwoody plants the primary xylem is the only water-conducting tissue, but in mature plants with secondary growth this function is mostly taken over by the secondary xylem.
   在尚未木质化的植物中，初生木质部是唯一的输水组织，但在具有次生生长的成熟植物中，该功能大多由次生木质部行使。