The European air traffic control agency Eurocontrol said only 6,000 flights would take place in European airspace Saturday - down from the 22,000 normally expected.

VOA: standard.2010.04.17

Right, so the things we want you to take away from this are, get into the habit of using pseudo code when you sit down to start a problem, write out what are the steps.

好，这儿我想大家明白的就是,养成解决问题时先写伪代码的好习惯,把步骤都写出来,我想要告诉你们的是一个好的程序员。

麻省理工公开课 - 计算机科学及编程导论课程节选

And here d, of course, can take the values from plus three down to minus three.

而d层，当然，能够包括从+3到-3的所有值。

麻省理工公开课 - 固态化学导论课程节选