liù fāng zuì mì duī jī
hexagonal close-packed (HCP) (math.)
六
liù
six
方
fāng
square
最
zuì
(before an adjective or verb) to the highest degree; (the) most ...; -est
密
mì
name of an ancient state
堆
duī
to pile up
积
jī
to amass; to accumulate; to store up
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