Curve ball

or curve·ball n.

1. Baseball. Any of several pitches that veer to the left when thrown with the right hand and to the right when thrown with the left hand.
2. Slang. Something that is unexpected or designed to trick or deceive: That last question on the exam was a real curve ball.

idiom:

pitch (or throw) (someone) a curve ball Slang.

1. To mislead; deceive.
2. To cause to be surprised, especially unpleasantly so.                                                                        例句： The bell curve is a curve ball.   试译：钟形曲线说混淆视听。                                           

The U.S. Public Service Academy will be the civilian counterpart to the military service academies, a flagship institution designed to build a "more perfect union" by developing leaders of skill and character dedicated to service in the public sector.

At the Academy, more than 5000 students will get a federally-subsidized undergraduate education focused on service and leadership development, followed by five years of service in public sector jobs following graduation. The Academy will develop a new generation of top-quality civilian leaders and will help transform the way Americans perceive, prepare for, and pursue public service.

Quality time 优质时间 ，黄金时间？

is an informal reference to time spent with loved ones (e.g., close family, partners or friends) which is in some way important, special, productive or profitable. It is time that is set aside for paying full and undivided attention to the person/matter at hand. It may also refer to time spent performing some favored activity (e.g., a hobby). The opportunity to experience quality time, or the actual time available to enjoy quality time is often limited. However, this is outweighed by the importance, intensity or value attached to events or interactions which occur during quality time. Quality time therefore has a degree of emotional or social "quality" which other aspects of personal life may lack.
Busy parents may also use the term to justify the limited amount of overall time they spend with their children.

In terms of critique, it is occasionally pointed out that true quality time with children cannot be rigidly scheduled, but that “quality moments” can happen if there are sufficient opportunities for sharing time and adults adapt to their children´s needs and interests.^[1] On the other hand, putting time with children into their schedules is a way in which parents can make a commitment that time together is a priority in their lives.[2