We need to optimize this process.

It is difficult to find the optimal solution to this problem.

This juice contains preservatives.

Antibiotics don't work for colds, so rest is the best.

I use bleach to wash my white shirts.

I received treatment using an anesthetic at the dentist.

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

This lunch box includes a refrigerant.

It's my habit to take vitamin pills every day.

This germicide can kill 99.9% of bacteria.