if the... or ... is mandatory,people have to do it because it is a rule of law老师讲mandatory说的帮忙补充
网校学员jac**在学习BEC商务英语初中级【四项全能实战签约班】时提出了此问题，已有1人帮助了TA。
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Wendy_Nancy
同学你好，该知识点来自沪江网校《BEC商务英语初中级【四项全能实战签约班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学好，这里老师说的应为mandatory的英文释义即If an action or procedure is mandatory, people have to do it, because it is a rule or a law.意为：强制性的; 法定的;义务的
如：the mandatory retirement age of 65 65岁的法定退休年龄
祝学习愉快~
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BEC商务英语初中级【四项全能实战签约班】
已有5人在本课程中发现了105个知识
已有78个知识得到了老师的回复
本课程热门知识点
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28:45, So ... earlier, this is the second part of... of working day, so today we mainly talk about changeing places ....
老师帮忙听下，第二个省略号后几乎没听懂 -
and guys I'm looking for seeing you in the next module
请问听的正确吗 -
25:07, well his .... be a waiter, Ok here, I'd like keep to list ...
老师，请帮忙听下