Everything moves in straight lines over the curved landscape of space-time.

宇宙万物都是沿直线运动的，只不过时空本身发生了扭曲。

African dung beetles are really good at rolling large balls in straight lines.

非洲屎壳郎真的很擅长在直线上滚动大球。

However, they all move in different patterns: in straight lines, zigzags and big circles.

直线，Z 字形和大圆圈。

These  squiggly lines represent photons which are actually travelling in straight lines.

这些波浪线代表实际上沿直线行进的光子。

We’d have timely, efficient subways running in straight lines, criss-crossing under the city.

我们会有及时、高效的直线运行的地铁，在城市下方纵横交错。

Denise glanced at the windows of his shop where the sticks and umbrellas were arranged in straight lines.

丹妮丝瞥了一眼他店里的橱窗， 那里的手杖和雨伞排列成直线。

Again, the fact that space is curved means that light no longer appears to travel in straight lines in space.

同样，空间是弯曲的这一事实意味着光似乎不再在空间中沿直线传播。

In the pictures, the men are running up the hill quickly in straight lines. There seem to be so many men that no enemy could stand against them.

在照片中，士兵们正沿着直线迅速地向山上跑去，似乎有许多人，没有敌人能与他们对抗。

It's a wave that travels in straight lines, yet it also reflects off of surfaces, refracts through various materials, and generally changes direction all the time!

它是一种直线传播的波，但它也会从表面反射，通过各种材料折射，并且通常会一直改变方向！

For example, if you have a parade, and you have some people playing instruments, we would call that a " marching band" because a group of musicians all walk in straight lines down the street.

例如，如果你有一个游行， 你有一些人在演奏乐器，我们会称之为“行进乐队” ，因为一群音乐家都在街上走直线。