by the后面加什么

　　By the time you get there the meeting will be over.

　　等你到了那里的時候，會議就該結束了。

　　Day care is provided by the company she works for.

　　她工作的那家公司有日托。

　　A new era was brought into being by the war.

　　那場戰爭使得一個新的時代產生了。

　　All the statistical computations were performed by the new software system.

　　所有的統計計算均由新的軟件系統完成。

　　By the age of 21 he controlled the company.

　　他21歲就掌管了公司。