123. It's no secret that there's a lot to put up with when waiting tables, and fortunately, much of it can be easily forgotten when you pocket the tips.

译文　

众所周知，等客人点菜的时候，服务员通常都需要百般忍耐，不过当他们把小费放入口袋的时候，就把这些麻烦忘光了。

点睛　

本句的结构是“It＋be＋名词（no secret）＋that从句”，其中it是形式主语，that引导的主语从句是本句真正的主语。
it is no secret意为“众所周知”。如：
It is no secret that Singapore owes it all to its uncorrupt leaders for where it is today. 众所周知，新加坡今天的成绩得归功于其廉洁的领导人。
短语put up with的意思是“忍受，承受”。如：
I could hardly put up with that guy any longer. 我再也不能忍受那家伙了。
pocket作动词讲时，意思是“将……放入口袋”。tip的意思是“小费”。

考点归纳　

it作形式主语的that从句是主语从句的一种，可有如下四种搭配：
It＋be＋形容词＋that从句。如：
It is essential that... 绝对必要的是……
It is significant that... 重要的是……
It is clear that... 很明显……
It＋be＋过去分词＋that从句。如：
It is recommended that... 据推荐/介绍……
It is known to us/all that... 众所周知……
It is anticipated that... 据预测……
It＋be＋名词＋that从句。如：
It is common knowledge that... ……是常识
It is a surprise that... 令人惊奇的是……
It is a fact that... 事实是……
It＋不及物动词＋that从句。如：
It appears that... 似乎……
It happens that... 碰巧……
It occurred to me that... 我突然想起……