In genetics, linkage disequilibrium is a very important concept.

He joined the multi-level marketing business.

He was penny wise and pound foolish, he bought a cheap smartphone but it broke immediately.

We should always remember the power of Kannon in difficult times.

He decided to start a multi-level marketing business.

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.

He contracted severe invasive streptococcal disease and underwent emergency surgery.