n. 活力( energy的名词复数 ); [物理学]（原子、电、辐射的）能; [常用复数]精力; （有效地发挥的）力量

n (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs

n forceful exertion

n enterprising or ambitious drive

n an imaginative lively style (especially style of writing)

n a healthy capacity for vigorous activity

n any source of usable power

n the federal department responsible for maintaining a national energy policy of the United States; created in 1977