adj.适当的,胜任的;
例句:
Sometimes we have to obey the theory of survival of the fittest.
有时我们不得不遵循适者生存的理论.
Life is a deadly struggle in which only the fittest survive.
生活是适者生存的一场殊死搏斗.
Only the fittest animals were survivors of the cold winters.
只有身体最强健的动物才能够熬过严冬.