The real tragedy of the poor is that they can do nothing but wait for the rich to give them something.

意识像河流一样流动，总是朝着有目的的方向前进。

A balcony or porch needs to be at least 6 feet (2m) deep or it won’t be used.

光波，无论是以太波还是其他波，在所有情况下都是时间上的周期性过程。