... The air mass between the top and bottom plates can also oscillate at the strings' natural frequencies. 面板与背板之间的空气也可以在琴弦的自然频率下共振。 Continental Air Defence Operation Plan 大陆防空作战计划 Under the dense fog effect, today the Beijing air mass still is that difference , weight contaminate very much. 在大雾的影响下，今天北京的空气质量还是非常差，重污染。 ...
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