His body was surprisingly flexible.

I am very interested in natural science.

Let's participate in the election by using early voting.

It's difficult to understand the context of this sentence.

He was diagnosed with congestive heart failure.

Because he has immunodeficiency, he always pays attention to his health management.

He was diagnosed with prostate cancer.

He was tried for the crime of desertion in the face of the enemy.

The lens of this camera is easy to attach and remove.

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.