We have maintained a good relationship for a long time.

After a cold front passes, the temperature drops sharply.

He works on an aircraft carrier.

My mother goes to the hospital every day to nurse my grandmother.

The signboard of that shop is very noticeable.

A kangaroo is a marsupial native to Australia.

Stem cell research is opening up new frontiers in medicine.

Please tell me your impressions of this movie.

This issue is closely related to his research.

I have been to Cambodia.