His condition is seriously ill, and he needs surgery immediately.

Bicarbonate helps neutralize acidic substances in the body.

He headed to the battlefield equipped to the nines.

His actions always have a duality.

He holds dual citizenship in America and Japan.

He repelled the enemy using the heavy rattan bow.

Haplology is a part of linguistics, referring to the phenomenon where a part is omitted when the same syllable repeats.

Tritium is one of the radioactive isotopes.

He was criticized for having a double standard.

These shoes have a double sole and are very durable.