要降低噪音，最简单的方法是增大旋翼桨叶的夹角，也叫“节距”，或是降低转速。
The simplest way to dampen a helicopter's noise is to increase the Angle of the rotor's blades, also called the pitch, and slow them down.
目前已克隆并发表的节旋藻基因仅30多个，有关节旋藻基因组学研究尚属空白，对节旋藻基因组特性更加缺乏了解。
Only 30 genes of Arthrospira have been cloned and published till now. The genomics study of Arthrospira is in a blank and even lacks understanding of Arthrospria genomic characteristics.
雪花又在窗外旋舞，扑打着结冰的窗棂，圣诞节转眼将至。
Snow was swirling against the icy Windows once more; Christmas was approaching fast.
雪花又在窗外旋舞，扑打着结冰的窗棂，圣诞节转眼将至。
Snow was swirling against the icy Windows once more; Christmas was approaching fast.
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