There were no special materials to block the noise of the engines.
没有特别的材料来阻隔引擎的噪声。
Wearing earplugs can also help block unwanted noise.
戴上耳塞同样也能屏蔽那些你不想听到的响声。
Low noise, fast, quad universal filter building block.
噪音低，速度快，四普及过滤积木。
Low noise, fast, quad universal filter building block.
噪音低，速度快，四普及过滤积木。
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