Just as unfit peacocks cannot grow splendid tails, so unfit people cannot sing well, dance well (for singing and dancing go together, as it were, like a horse and carriage) or play music well.

就好比不适合生存的孔雀不能长出美丽的雀尾，不适合生存的人类也不能唱出美妙的歌曲，跳起迷人的舞蹈（唱歌跳舞就好比马和马车一样紧密结合），抑或流畅演奏。

youdao

Just as unfit peacocks cannot grow splendid tails, so unfit people cannot sing well, dance well (for singing and dancing go together, as it were, like a horse and carriage) or play music well.

就好比不适合生存的孔雀不能长出美丽的雀尾，不适合生存的人类也不能唱出美妙的歌曲，跳起迷人的舞蹈（唱歌跳舞就好比马和马车一样紧密结合），抑或流畅演奏。

youdao