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原子堆
yuánzǐduī
1. atomic pile (original form of nuclear reactor)

Character Breakdown

原
yuán
source, origin, beginning
HSK 4 10 丶
子
zi
son, child; seed, egg; fruit; small thing
HSK 1 3 丶
堆
duī
crowd, heap, pile, mass; to pile up; measure word for things in piles or stacks
HSK 5 11 丶

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