本讲为2006年下半年新的教学内容，请对照教材、练习册、语法书听录音！

It goes without saying that 不言而喻，理所当然

of course, it goes without saying that youll be paid for the extra hours you work.

for the sake of 为了…之好处；为了…的目的
The company has decided for economys sake to close down this department.
Youre only arguing for the sake of arguing.