Unlike a normal lens, which compresses or changes the actual shape of a light wave through diffraction, a time lens magnifies or compresses the time of a light wave through dispersion.
不同于通常的透镜通过衍射来压缩或者改变光的形态，时间透镜通过光的弥散放大或者压缩光波的时间。
2
It has been difficult to estimate the possible wave heights of any tsunami - the waves may not arrive at all or could be as high as 10 metres above normal sea level.
海啸可能达到的波高向来很难估计-海浪可能根本无法到达，或者可高达超出海平面10米。
3
The Russian heat wave has persisted since late June, with daytime temperatures at least 12 Fahrenheit degrees above normal - and often much more - for over a month.