bound 这个单词太难学了，想问一下bound这个单词和包括这个词的词组怎么用，最好有例句，谢谢！
Bound
Rate约束税率；束缚税率；约束税；约束汇率
bound
volume合订本；合订版；合订；数量
bound
level约束水平；束缚程度；束缚能级；约束程度
bound
control绑定控件；绑定型控件；约束控件；系结控制项
homeward
bound归心似箭；返航；归途；回家
Prometheus
Bound被缚的普罗米修斯；普罗米修斯受罚；普罗米修斯之缚
bound
auxin束缚生长素；生长素；束缚生长激素；监禁发展素
bound
theorem界限定理
Blood
Bound再以血统；再以血缘；血之链；血之束缚
If
you say that something is bound to happen, you mean that you are sure it
will happen, because it is a natural consequence of something that is already
known or exists. 必然会
If an area of land is bounded by something, that thing
is situated around its edge. 位于…的界线周围
If someone's life or situation is bounded by
certain things, those are its most important aspects and it is limited or
restricted by them. 约束
mandatory和compulsory有什么区别
compulsory指的是依据法律法规必须得做的。例如，我们所说的义务教育，服兵役等。这些针对国民每一个人来说，都是有责任有义务必须履行的。
mandatory则是指获得某种授权（后）必须得做的。比如党政领导干部，必须遵纪守法，不得擅自做主更改政策等。
例句辨析：
mandatory
1、It's mandatory for citizens to pay taxes.
公民有征缴税款的义务。
2、This independent review of domestic financial systems should be mandatory and public.
这一对国内金融体系的独立审查应该是强制性的和公开的。
3、In2003 the company has passed the ISO9001 quality management system certification and accreditation mandatory CCC.
公司已于2003年通过了ISO9001质量管理体系认证和CCC强制性认证。
compulsory
1、In Germany learning Russian was not compulsory.
在德国，俄语不是必修课。
2、Many young men are trying to get away from compulsory military conscription.
很多年轻人试图逃避强制征兵的政策。
3、English, Maths, ICT and science are compulsory subjects.
英语、数学、信息与通信技术和科学是必修科目。
