fasten oneself upon

例句：

1. 1.She fastened the door securely before leaving.
   她离开前把门牢牢地系上了。
2. 2.He fastened his coat to keep warm.
   他系上外套以保持温暖。
3. 3.The thief tried to fasten the door shut but failed.
   小偷试图将门紧紧关上，但失败了。