at least: 至少
At least that's the theory.
至少理论上是这样。
Would you at least look at me?
你总该看我一眼吧？

in possession of: 控制，拥有
She was found in possession of dangerous drugs.
她被发现藏有危险药品。
In practice the mortgagor will usually remain in possession of the property.
实践中抵押人通常仍保留着对财产的占有。

burn down: 烧毁
I watched two buildings on my block burn down.
我目睹了我们街区中两幢楼房的烧毁。