The Summer Triangle is shining in the night sky.

I always take a walk in the mountains and forests on weekends.

He studied deeply about communism.

This cheap seal is not only inexpensive, but also of good quality.

3Q for your help.

He is a citizen of three countries, holding citizenship in America, Canada, and Japan.

It took him a week to cross that mountain range.

I have been to Saint Petersburg.

This figure is an acute triangle.

Aldaric acid is a compound produced by the oxidation of sugars.