Definition
used to indicate that a task has been successfully completed, often when it was easier or faster than expected.
大功告成（表示任务已轻松完成）
"We've finished writing the report." "Great, job done!"
"我们已经写完报告了。" "太好了，任务完成！"
I fixed the printer in about ten minutes, job done.
我大约十分钟就修好了打印机，任务完成。
I packed everything into the car very quickly, job done.
我很快就把所有东西都装上了车，任务完成。