前4阶
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previous four orders modal frequencies 前阶固有频率
previous four orders
前四个订单
以上为机器翻译结果，长、整句建议使用 人工翻译 。
As you may have noticed, Apple's shipping times for online orders have now slipped yet again from the previous two to three week estimate to a lengthy three to four weeks, although things may not be quite that straightforward.
ENGADGET: iPad 2 shipping estimates now three to four weeks, retail availability hit and miss
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