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.

Workers of all countries, unite, let's show our power.

Workers of the world, unite, the time has come to show our strength.

He pledged his allegiance to the country as a vow.

He felt sick and vomited.

He is suffering from acute leukemia.

He contracted severe invasive streptococcal disease and underwent emergency surgery.

He is a person with a strong heart.

He taught me how to tie a tie.

There is not a single cloud in the sky.