inside the part of a sports field or court in which play is conducted
在运动场地边线以内
(of a place) outside the limits of where one is permitted to be
超出界限
his kitchen was &B{out of bounds to} me at mealtimes.
用餐时间，我不得进他的厨房。
focusing on to the exclusion of all else
热衷于，献身于，沉迷于
she was too bound up in her own misery to care that other people were hurt.
她沉迷于自己的痛苦之中无法自拔，根本没去想别人是否受到伤害。
closely connected with or related to
与…有密切关系的
democracy is bound up with a measure of economic and social equality.
民主与经济和社会平等程度有着密切关系。
used to emphasize that one is sure of something
我敢肯定
she's hatching more little plots, I'll be bound!.
我敢肯定她正在策划更多的小阴谋！。
used to precede a statement which one feels it is one's duty to make, however unwelcome it may be to the hearer
我有责任说
I'm bound to say that I have some doubts.
我有责任告诉大家我有些疑问。