1、She untied the ribbon and opened the present.
她解开了丝带，打开了礼物。
2、He quickly untied the knots that held the package together.
他迅速解开系着包裹的结。
3、The rescue team was able to untie the trapped hiker from the ropes.
救援队成功地将被绳索困住的徒步旅行者解救出来。