by half

例句：

1. 1. I need to finish this project by half next week.
   我需要在下个周末之前完成这个项目的一半。
2. 2.She decided to take a break by half an hour before the meeting.
   她决定在会议开始前半小时休息一下。
3. 3. He asked for a loan by half the amount he had borrowed.
   他要求借到他借的金额的一半。