keep watch over的用法和樣例：
例句
- The dog kept a vigilant guard over the house.
這隻狗警惕地守護著這所房屋。 - While the Final Watch is busy fighting it, Anton gets to the sixth level.
最後的守護者忙於戰鬥的時候，安東來到了第六層。 - Keep a close watch on the enemy rs movements.
密切注意敵人的動向。 - Everyone must keep a sharp lookout for this sign.
大家要密切注意這個標記。
