Quails typically have short rounded wings that enable them to spring into f

Quails typically have short rounded wings that enable them to spring into f

题目
Quails typically have short rounded wings that enable them to spring into f
quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.中的“when disturbed”为什么不是"when they are disturbed" 这个用法是什么语法,似乎对理解没问题,但是感觉总缺点什么成分!
答案
举一反三
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想找英语初三上学期的首字母填空练习……
英语翻译
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