He is researching the effects of underground nuclear tests.

He likes to take a walk in the park at dusk.

My house is near the station.

It is reported that North Korea has conducted another underground nuclear test.

Groundwater pollution has become a serious environmental problem.

He grew up in a slum, but now he is a successful businessman.

He sleeps while snoring every night.

The ship capsized.

By learning Pinyin, you can accurately understand the pronunciation of Chinese.

Velar sounds occur when the back of the tongue contacts the soft palate.