Really? So when did it become popular?

真的吗？那么它什么时候变得流行的？

When did online shopping start to become popular?

网上购物什么时候开始流行起来的？

Art galleries have recently become popular places to visit in Saudi Arabia.

艺术画廊最近成为在沙特阿拉伯受欢迎的参观地点。

Courses that are taught via the Internet, or online courses, have become popular in many countries.

通过互联网教授的课程或在线课程在许多国家变得流行。

Yoga has become popular as a form of exercise.

瑜伽作为一种锻炼方式变得非常受欢迎。

Though such tools have not become popular yet.

虽然这样的工具还没有普及。

If the cars become popular, there is likely to beair traffic jam.

如果这些汽车流行起来，很可能会出现交通堵塞。

They did not become popular until the emergence of improved batteries.

直到改进的电池出现，它们才流行起来。

The flying cars won't bring air traffic jam even when they become popular.

飞车即使流行起来也不会造成空中交通堵塞。

From the passage, we know that waste sorting starts to become popular in China.

从这篇文章中，我们知道垃圾分类开始在中国流行起来。