孩子们太累了,在乘车途中就完全睡着了。

The children were so tired that they fell fast asleep during the car ride.

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The children were so tired that they fell fast asleep during the car ride.

fast 在这里不是"快速"的意思,而是表示"完全地、彻底地"的副词用法。 asleep 是形容词,由前缀 a-(表示状态)和 sleep(睡觉)组成,意思是"睡着的"。 fast asleep 表示"熟睡的、睡得很沉的",强调完全进入睡眠状态。

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