Until April this year, when it switched to a multi-tiered pricing system, every song available on iTunes cost a uniform 99 cents in America, 79 pence in Britain and so forth.
直到这几年Apple公司才将收费策略转向多重价格策略，在美国每首在iTunes上的歌统一价格为99美分，而在英国是79美分。
It encourages a specialized division of labor gradually forms a new multi-tiered cooperative system of principal weaponry contractors sub-contractors and suppliers of parts and components.
推进专业化分工协作，逐步建立由武器装备主承包商、分包商和零部件供应商组成的分层次的新型社会协作体系。
It encourages a specialized division of labor gradually forms a new multi-tiered cooperative system of principal weaponry contractors sub-contractors and suppliers of parts and components.
推进专业化分工协作，逐步建立由武器装备主承包商、分包商和零部件供应商组成的分层次的新型社会协作体系。
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