这家初创公司经过三年发展，现在已成为一家成熟的企业。

After three years of growth, this startup is now a ___fully-fledged business.

经过两年的培训，她成为了一名合格的医生。

After two years of training, she became a ___fully-fledged doctor.

这些雏鸟已经长成羽翼丰满的成鸟，随时可以离巢飞翔。

The young birds have become ___fully-fledged adults and are ready to leave the nest.