Reducing greenhouse gas emissions is important for environmental protection.

We need to evaluate the cost-effectiveness of this project.

We need to evaluate the cost-effectiveness of this project.

The photoelectric effect is a phenomenon where a material emits electrons after absorbing light.

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

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

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.