中空

hollow / empty interior

zhōng = zhu + (e)ng1

China / Chinese / surname Zhong

zhōng = zhu + (e)ng1

within / among / in / middle / center / while (doing sth) / during / (dialect) OK / all right

zhòng = zhu + (e)ng4

to hit (the mark) / to be hit by / to suffer / to win (a prize, a lottery)

kōng = ku + (e)ng1

empty / air / sky / in vain

kòng = ku + (e)ng4

to empty / vacant / unoccupied / space / leisure / free time

double glazing

中空 currently does not appear in any sentence.

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