In this experiment, we will use an indicator to observe the reaction between acids and bases.

These two software have complete interchangeability.

Everyone, please have a good new year.

When he had a problem due to his own actions, he remembered the phrase 'chickens come home to roost'.

When my stomach hurts, I always take an antacid.

My stomach hurt, so I took a laxative.

I am taking antihistamines for my allergies.

He was prescribed antidepressants by his doctor.

He was prescribed antidepressants by his doctor.

It's important to take the oral contraceptive pill at the same time every day.