suffice

1.对于高阶英语学习者来说，每天学一个词是不够的。

For advanced English learners, a word per day does not suffice.

2.想要提升英语水平，仅仅做泛读是不够的。

Just extensive reading can not suffice to improve English level.

(suffice to do sth 足够做某件事情)