sewer-pipe clay沟管土
porous-clay pipe drain多孔粘土排水管
clay pipe iron-wire triangle三角架
clay pipe iron-wire triopinion三角架
N（名词） a fine white pure clay, used in the manufacture of tobacco pipes and pottery and for whitening leather and similar materials 白陶土
V（动词） to whiten with pipeclay 用白陶土使变白