This is an unprecedented crisis.

Since he is still a green hand, he may make many mistakes.

This is my unused camera.

She is still an innocent girl, with a pure heart.

She is still a virgin.

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

The National Research and Development Agency plays a crucial role in advancing science and technology.

He claims to have seen an unidentified flying object.

With the spirit of preparing before it's too late, he started studying a week before the exam.

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.