built-in function的用法和樣例：
例句
- Adding a library function to do this will save the scriptwriter time, and improve the maintainability of the scripts.
添加一個庫函數來做這些事情將會節省腳本編寫者的時間，並且能改進腳本的可維護性。 - They indicate that the application is busy with some internal function and that performance in other areas is likely to degrade.
它們向用戶表明當前程序正在忙於某些內部功能，其他功能的處理能力可能會降低。
