This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

When will this pain end?

He participated in the anti-war movement.

The volcano erupted.

His cooking skills are among the top five.

In which direction is your house?

The result is certainly the result of his efforts.

My mother woke me up.

In linear algebra, triangular matrices play a very important role.

A diagonal matrix is a matrix in which all elements outside the main diagonal are zero.