I requested a refund because the product was defective.

The product was defective, so I asked the clerk to return the money.

This shape is a parallelogram.

He is an excellent arranger, and has produced many musical works.

The calculus of variations is a branch of mathematics that deals with the optimization of functions.

He is good at playing Beethoven's variations.

The amygdala is a part of the brain that controls our emotions.

Almond oil is indispensable in my skincare routine.

This medicine contains bitter almond oil dissolved in water, and it tastes bitter.

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