Good question. I think part of the reason for more blacks low reading skills is, to do with the history of being heavy slaves.

好问题,我认为黑人阅读能力差的部分原因是,他们经历了较长时间的奴役史。

麻省理工公开课 - 媒体、教育、市场课程节选

It means, when you are accelerating upwards, as the elevator picks up speed, the reading on the spring will be more and you will feel heavy.

也就是说当你向上做加速运动时,就像电梯加速的时候,弹簧的读数会增大,你会觉得自己变重了

耶鲁公开课 - 基础物理课程节选

I will say that the reading load is heavy.

我可以告诉你们，阅读量很大。

耶鲁公开课 - 1945年后的美国小说课程节选