(1)be committed to sth致力于某事

The doctor was committed to practical medicine.

那位医生致力于实用医学。

(2)remain committed to sth 仍然致力于某事

He said the government remained committed to peace. 

他说政府仍然致力于和平。

(3)commit oneself to sth 某人致力于某事

He has committed himself to the cause of education.

他致力于献身教育事业。

He committed himself to the cause of modernizing the country's industry.

他致力于国家的工业现代化建设事业。

(4)be committed to doing sth 致力于做某事

This development area is committed to creating a perfect investment environment.
这个开发区致力于创造一个完美的投资环境。

备注：以上to为介词标志，后接名词或动名词。