I will participate in an obstacle race this weekend.

In this situation, the proverb 'it is best to submit to circumstances' applies.

He is an expert in astrophysics.

He was out of breath after running a long distance.

German New Guinea was once a German colony.

He deeply understands philosophical principles.

The Daijō-kan was the highest administrative organ in ancient Japan.

He started smoking due to peer pressure.

Basic oxides react with acids to produce salt and water.

This area is affected by radioactive fallout from past nuclear tests.