He pulled the stage curtain.

The membrane of this cell is very thin.

Wheat is an important ingredient for making bread.

On New Year's Eve, you can hear the sound of firecrackers.

The police found explosives at that location.

This water has too many bacteria to drink.

We must not forget the horror of the atomic bomb.

He revealed his secret.

The police found an explosive substance at the location.

The police found the bomb and defused it.