Parents are legally obliged to make sure their children attend school. 依照法律，父母有义务确保自己的孩子上学。

Legally, the shareholders are the owners of the company. 依照法律，股东是公司的拥有者。

legally binding (=that must be obeyed according to the law) Once you’ ve signed the agreement, it becomes a legally binding document. 有法律约束力的