a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
A pile of rocks
n an old term for a landmark that consisted of a pile of stones surmounted by an upright slab
A pile of roots, set with plants, mosses, etc., and used as an ornamental object in gardening.
A pile of arched tiles, used to catch and retain oyster spawn.
a pile of shit
废话, 胡说, 废物, 卑鄙者
