spray drain
 排水暗溝


 Spray n.
 1. A small shoot or branch; a twig.
 Syn: -- sprig.
 The painted birds, companions of the spring,
 Hopping from spray to spray, were heard to sing.   --Dryden.
 2. A collective body of small branches, or cut flowers with long stems; as, the tree has a beautiful spray; many sprays were sent in condolence to teh funeral home.
    And from the trees did lop the needless spray.   --Spenser.
 3. Founding (a) A side channel or branch of the runner of a flask, made to distribute the metal in all parts of the mold. (b) A group of castings made in the same mold and connected by sprues formed in the runner and its branches.
 Spray drain Agric., a drain made by laying under earth the sprays or small branches of trees, which keep passages open.