He warned about the dangers of nuclear warheads.

Finding the Summer Triangle is helpful for remembering constellations.

The Winter Triangle is shining in the night sky.

He decided the course while looking at the sea chart.

The sum of the internal angles of this triangle is 180 degrees.

Daily exercise is indispensable in my life.

The buyer for this house has not been found yet.

My father underwent surgery for hemorrhoids.

The last day of the month in the lunar calendar, which is determined by the waxing and waning of the moon, is called Misoka.

I have visited Tsutenkaku.