The parasympathetic nervous system helps our body to relax and conserve energy.

The kangaroo is a species native to Australia.

Learning how to use compound verbs is important for understanding Japanese grammar.

Compound nouns are a very important part of Japanese grammar.

He is training his rectus abdominis muscle every day.

If you train your transverse abdominal muscle, your body balance will improve.

He is doing a special exercise to train his digastric muscle.

He never misses doing his gastrocnemius muscle stretches every day.

This area is rich in subterranean rivers, which serve as a source of groundwater.

He was surprised to hear the news.