This one, C10H22, which is also a common ingredient of gasoline, helps WD-40 remain a liquid at cold temperatures. Decane doesn't freeze until around -21 degrees Fahrenheit.

癸就是C10H22，是一种常见的石油烃，癸的熔点是- 29摄氏度，因此它可以保证WD - 40在低温下仍然保持液态。