extent

n. 广度,宽度,长度,大小,范围,范围,程度
n. [律]<英>扣押, <美>临时所有权令

I was amazed at the extent of his knowledge.

我对他知识的渊博感到惊奇。

From the roof we were able to see the full extent of the park.

从屋顶上我们能看到公园的全景。