The Xin was a short-lived dynasty in Chinese history.

The exploration of the neo-world has begun.

I have a headache due to lack of sleep.

I sleep for 8 hours every night.

He looked at the coffin and was devastated by deep sorrow.

The rain was so heavy that it soaked through my umbrella.

He set out on a journey in search of a new world.

My understanding of this issue has deepened.

We need to deepen our understanding of this issue.

During the Great Leap Forward, China's economy changed dramatically.