"devote to do" 与"contribute to"有什么区别,它们分别又有什么用处?

devote to do
give（oneself,one's time,etc．）freely to,dedicate to 致力于；献身于
She has devoted herself to the medical science．她一直致力于医学研究.
contribute to
1．give（money or time）to；supply（written materials）to 捐（款）；把（时间）投入；投（稿）
2．help to bring about；have a share in 贡献；有助于
All these factors contributed to his success．所有这些因素促使他成功了.