鸟、虫的叫声 chirp
指虫鸟长声的鸣叫 chirp in slow tone
鸟 虫的叫声
The sound of birds and insects
以上为机器翻译结果，长、整句建议使用 人工翻译 。
首先引起他们注意的是，那些幼年感染过寄生虫的雄鸟叫声要比其它鸟短三分之一，而且开叫也相对较迟。
Their first observation was that the songs of those males that had suffered fleas in early life were a third shorter than those sung by the others.
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