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He informed the station at once, but no one there was able to explain the mystery.
The officer in the control tower was very angry when he heard the news, because balloons can be a great danger to aircraft.
He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object.
might be doing 對正在進行的動作的推測
keep track of 跟踪、注意某事的进展
史蒂文斯先生在住院期间通过电话了解他的生意情况。
Mr. Stevens kept track of his business by telephone when he was in the hospital．
object
（1） n. 物體、東西
那是什麼奇怪的東西在箱子裡嗎？
What’s that strange object in the box ？
我可以看到一個物體在天空中閃耀。
I could see a shining object in the sky .
（2）n.對象、目標
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an object of interest
（3） n. 目的、目標 （aim , purpose）
他的人生目標就是富有。
His object in life is to be rich .
你來訪的目的是什麼？
What’s the object of your visit ？
The pilot managed to circle the balloon for some time.
manage to do sth 設法做成某事
你找到房子了没有?
Did you manage to find the house?
