Primary and Secondary Visibility 第一可见性和第二可见性的概念
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。
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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