extent
单词辨析：
指事物的大小、面积、范围或重要性、严重性等的程度。
She is in debt to the extent of 50,000 dollars.
她负债已达5万美元。
We were amazed at the extent of his knowledge.
我们对他知识之渊博感到惊奇。
Business declined to such an extent that the firm had to close.
生意如此惨淡，公司只好停业。
指学科、话题、事件等涉及的范围。
This course covers the psychological area.
这门课程涵盖心理学领域。
She wants to be involved in every area of his life.
她想参与他生活的方方面面。
指事情的极限或可以接受的范围，常用于比喻。
It's beyond the bounds of my ability.
这超出了我的能力范围。
Knowledge knows no bounds.
知识是没有穷尽的。
多指事物的宽度或范围，强调广泛性。
The breadth of the forest is very large.
这片森林覆盖范围很广。
We need to develop the breadth of our knowledge.
我们需要拓宽知识范围。
相关例句：
The government itself has little information on the extent of industrial pollution
政府本身几乎不了解工业污染的程度。
No medication works in isolation but is affected to a greater or lesser extent by many other factors
药物治疗不可能孤立地发生作用，多多少少会受很多其他因素的影响。
I realized the extent of the trouble that Mary Morse was brewing up
我意识到了玛丽·莫尔斯正在制造的麻烦有多大。
To an extent, that is the reason for the meeting.
在某种程度上，那就是召开这次会议的原因。
He could only be sorry to the extent that this affected his grandchildren
这件事甚至都影响到了他的孙辈，他只有伤心的份儿。
The extent to which it helped to promote Britain's broader strategic interests was sometimes questionable
它对于促进英国获得更广泛的战略利益到底有多大的帮助，这一点有时候值得怀疑。