But when I pulled out my pack it was too light and stray bits of tobacco made that soft rustling sound so I knew I was out of cigarettes.
可是当我翻开我的包时，我才发现，它如此轻，里面只有些残留的烟渣，发出簌簌的声音，我的烟，抽完了。
Pack light: Your luggage is weighed at checkin so that the amount of fuel needed for the flight can be calculated.
轻装上阵：登记的时候你的行李要称重，来计算飞机飞行需要的燃料量。
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