burn the candle at both ends字面意思一根蜡烛两头烧，引申为起早贪黑而疲惫不堪；起早摸黑地干；过度耗费精力。

【例句】
They like to enjoy life and often burn the candle at both ends.
他们喜欢及时行乐，往往过度消耗精力。

Mark is burning the candle at both ends. If he doesn’t change his schedule, he is going to get sick.
Mark现在起早贪黑的疲惫不堪。如果他不改变作息，他会生病的。