HSK 5
当成
dàngchéng动
to consider as; to take to be
孩子把纸箱当成了小汽车。
Hái zi bǎ zhǐ xiāng dàng chéng le xiǎo qì chē.
The child treated the cardboard box as a little car.
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New in the HSK 3.0 word list at level 5.