There are concerns that some could accept the standards and then lack the money to follow them.

VOA: special.2010.07.22

If a photon which has no mass can behave as a particle, does it follow then an electron which has mass can behave as a wave? 1920.

如果一个没有质量的光子,能像粒子一样运动，那么它能像一个,没有质量的电子那样以波的形式运动吗。

麻省理工公开课 - 固态化学导论课程节选

If you had a course in probability and statistics, then you'll find it easy to follow, but it's self-contained again.

如果你们学过统计学或者概率论,你们会比较容易理解,也需要你们独立学习

耶鲁公开课 - 金融市场课程节选

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