His articular cartilage has worn down due to age.

I work at the summary court.

Due to the impact of the Wuhan virus, the whole world is in a difficult situation.

He couldn't hide his remorse for the failure.

If you rephrase that complex theory in simpler terms, it's just common sense.

He daringly accepted the challenge.

He was promoted to an executive in the company.

I like to add dehydrated vegetables to my soup.

We went to the aquarium with our family on the weekend.

We must strive to protect the environment of the Earth.