early本身就既是形容词又是副词 ；
early
adj.早期的;初期的;早先的;早到的;提前的;提早的；
adv.在早期;在初期;在开始阶段;提早;提前;先前;早些时候;…之前
She finds it very difficult to get up early.
她觉得很难早起。
Quite a few people are going to arrive early.
相当多的人打算早到。
Certainly, the early years are crucial to a child\'s development.
毫无疑问，幼年对儿童的成长至关重要。
