同学你好，该知识点来自沪江网校《高中水平直达托业目标800分【新题型 全额奖学金班】》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
for the sake of 是固定词组，意为：为了…起见;
例句：
She called on us merely for the sake of courtesy.  她来访只是为了礼貌。
For the sake of the bad weather, I can't go out. 由于天气不好，我不能出去。
For the sake of drinking too much beer，I need go to WC now.
为了多喝点啤酒，我现在就要去厕所。

祝学习愉快！