(noun.) one of two or more layers one atop another; 'tier upon tier of huge casks'; 'a three-tier wedding cake'.
(noun.) something that is used for tying; 'the sail is fastened to the yard with tiers'.
(noun.) a worker who ties something.
(noun.) any one of two or more competitors who tie one another.
阿曼达录入
朱厄尔录入