The primary means of synchronization is the use of synchronized blocks, which provide both mutual exclusion and visibility guarantees.

同步的主要方式就是使用synchronized块，它既提供了互斥又提供了可见性保证。

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This study suggested the primary pollutant which should be controlled was PM2.5 to increase the visibility in Beijing.

研究的结果提示提高北京地区大气能见度，需要控制的首要污染物为PM 2.5。

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This study suggested the primary pollutant which should be controlled was PM2.5 to increase the visibility in Beijing.

研究的结果提示提高北京地区大气能见度，需要控制的首要污染物为PM 2.5。

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