例如： As is well known to us，it is important for the students to know the world outside campus．
The reason for this is obvious．Nowadays，the society is changing and developing rapidly，and the campus is no longer an“ivory tower．As college students，we must get in touch with the world outside the campus．Only in this way can we adapt ourselves to the society quickly after we graduate．
再如： Does it pay to be honest？This is a topic that is being widely talked about and different people have different opinions on it．
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