apply themselves to the study是apply to 的什么用法?

问题描述:

apply themselves to the study是apply to 的什么用法?

致力于研究
致力于,专心致志于:
to apply one's mind (或oneself) to economic work
致力于经济工作
to apply oneself perseveringly to the task of
锲而不舍地致力于…工作