in force   (TTS發音)

1. have power；become law生效

    The system of conscription has been in force for many years. 征兵制度已經實行好多年了。

    The treaty shall remain in force for a period of ten years. 這條約的有效期為10年。

    New timetable is in force. 新的時間表現在生效。

2. a great number of；in a large group大批；大量

    The enemy is in force behind the hill. 敵人在山後集結了大量兵力。