| 空前的纪录 all-time record |
| 空前的胜利 an unparalleled victory |
| 空前的规模 an unprecedented scale |
| 空前繁荣 be flourishing as never befo... |
| 空前绝后 never known before and never... |
| 空前高涨 rising to an unprecedented h... |
| 空动 lost motion |
| 空勤 air duty |
| 空勤人员 aircrew |
| 空勤组 aircrew |
| 空勤组成员 aircrewman |
| 空包弹 black cartridge |
| 空化 cavitation |
| 空化作用 cavitation |
| 空化噪声 cavitation noise |
| 空化机理 cavitation mechanism |
| 空口 eat dishes without rice or w... |
| 空口无凭 a verbal statement without a... |
| 空口白话 make empty promises |
| 空口说大话 brag |
| 空口难凭 An oral promise is not enoug... |
| 空号 space |
| 空喊 indulge in empty shouting |
| 空喜一场 dreamed of happiness |
| 空地 opening |
