It's time to put our plan into operation.

　　現在應該執行我們的計劃了。

　　The system has been in operation for six months.

　　這個系統已經運行六個月了。

　　The operation could prolong his life by two or three years.

　　這次手術可使他多活兩三年。

　　His quality of life has improved dramatically since the operation.

　　手術后他的生活質量大大改善了。

　　The new rules come into operation from next week.

　　新規定從下周起實施。