I decided to take a painkiller because I have a severe headache.

I always use fabric softener when I do laundry.

I sprayed insecticide in the garden.

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

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

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

Reducing greenhouse gas emissions is important for environmental protection.

This building is equipped with an impermeable wall, preventing water intrusion.

He was prescribed an antidepressant.

He was prescribed antidepressants by his doctor.