| 空 |
kōng qián | unprecedented |
| 空 |
kōng | empty / air / sky / in vain |
| 空 |
kòng | to empty / vacant / unoccupied / space / leisure / free time |
| 前 |
qián | front / forward / ahead / first / top (followed by a number) / future / ago / before / BC (e.g. 前293年) / former / formerly |