面心立方最密堆积miàn xīn lì fāng zuì mì duī jīmianxinlifangzuimiduijiface-centered cubic (FCC) (math.)Characters in this word堆crowd, heap, pile, mass密secret, confidential心heart方square, rectangle最most, extremely, exceedingly积to store up, to amass, to accumulate立to stand面faceStudy it in Yanamino