tier
n
any of a series of rows (esp of seats) or parts of a structure placed one above the other 一排(尤指座位); (階梯式的)一層
a box in the first tier, ie in atheatre (劇院中的)第一排的一個包廂
a wedding-cakewith three tiers/a three-tier wedding-cake 有三層的結婚蛋糕. =>illus at layer 見 layer 插圖.