| 释义 |
DictionarySeeslateroofing slate
roofing slate[′rüf·iŋ ‚slāt] (materials) Hard varieties of slate varying in size from 12 × 6 inches (30 × 15 centimeters) to 24 × 14 inches (60 × 35 centimeters), and from ⅛ to ¾ inch (3 to 19 millimeters) in thickness. slateA hard, brittle metamorphic rock consisting mainly of clay minerals, characterized by good cleavage along parallel planes; used extensively as dimension stone in thin sheets for flooring, roofing, panels (both decorative and electrical), and chalkboard, and in granular form as surfacing on composition roofing. |