The glands produce several substances which regulate a variety of body functions and are necessary to sustain life. (svsvet.com)
In recent years, scientists have used this algorithm to discover several substances that are «forbidden» in classical chemistry and that may be stable at high pressures. (sciencedaily.com)
Although a detector package could target a single type of vapor, a manufacturer could add it to a unit that detects several substances. (sciencedaily.com)