bounds
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：
He's improved in leaps and bounds this season
他今季的表现一日千里。
His greed for power knows no bounds.
他的权力欲是无止境的。
The passion of Argentinian football fans knows no bounds.
阿根廷足球迷极为热情。
The ball bounced out of bounds.
球弹到了界外。
When old comrades-in-arms meet, their happiness knows no bounds.
老战友欢聚一堂，其乐融融。
Knowledge knows no bounds.
知识是没有穷尽的。