Pilot24 studies had shown that what might seem an obvious fourth procedure, to tone down25, rather than enhance feather colour, was too damaging to work.
Pilot24 studies had shown that what might seem an obvious fourth procedure, to tone down25, rather than enhance feather colour, was too damaging to work.
试验性研究已经表明，似乎可明显看作是第四种的做法———即把鸟的羽毛颜色变浅而不是加重———是非常有害的。