He kept a watch on how climate change was affecting both the Himalayas and the Alps.

他还留心观察气候变化对喜马拉雅山脉和阿尔卑斯山脉的影响。

Perhaps you're right, but I think the story is out of date. No one keeps a watch on a chain any more.

也许你是对的，但我觉得这个故事过时了，没有人还留着链表了。

Ten of the samurai climbed the rooftops, took out their bows and kept a watch on the courtyard to make sure nobody escaped to call for reinforcements.

十名武士爬上屋顶，拿出弓箭，在院子里放哨，确保没有人逃跑，没有人呼叫援军。

The purpose of building this tree house, deep in the Ecuadorian wilderness is to keep a watch on Mt. Tungurahua, an active volcano situated nearby.

在厄瓜多尔荒野深处建造这座树屋的目的是监视附近的活火山通古拉瓦山。