No metal had been employed in the construction of the wagon, nor any artificial substances: nature had supplied everything.

He could detect a great many artificial substances coursing through her blood and muscles.

Even artificial substances such as slag glass are used.

Smaller cards of an artificial substance, which move very swiftly in the compilers.

These are artificial substances that, so far as we know, are found nowhere else in the Solar System.

The difference between the natural and artificial substance is that the atoms or molecules are artificially (human) constructed materials.

Modern fishing lines are usually made from artificial substances.

"From those 12 guys, I'm sure that most of them, they didn't have anything to do with some artificial substances."

The use of artificial substances or devices only detracts from the game.

Some kind of artificial substance she didn't recognize.