... 承受水平 acceptor level 城市测量数据库 data base for urban survey 乘（数）商（数）寄存器 MQ register ...
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某些城市的测量甚至包括PM 2.5等更小的微粒，这些也被收入数据库之内。
In some cities, measurements of even smaller particles such PM2.5 are available, and these are also included in the database.
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