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阶段性生产方式

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The paragraph below has been taken from the text but includes ten blanks. You are required to select one word for each blank from a list of words in the word bank provided. You may not use any of the words in the word bank more than once.Why, in this modern society, do paraplegics still have to (1) each trip to the corner shop as if it was a (2) military operation? Why is it that it is still not possible for people like myself to get onto a bus or a train without the (3) of at least two strong friends? This is made even more of a (4) when taxi drivers who see a person in a wheelchair (5) past and pretend not to see me. Why do so many shops not have doors or elevators that somebody in a wheelchair can use? Why do so many cinemas, restaurants, theatres, sports stadiums, etc. still not provide (6) where a wheelchair can be placed so aparaplegic can (7) the same (8) and rights as other (9) of society? Why do we still have kerbs at the edges of roads that make it almost (10) for a wheelchair to cross the road?

简单阐述HDFS采用抽象的块概念可以带来以下几个明显的好处。

HDFS结构设计的局限性有哪些？