| English | eng-000 |
| primary combustion | |
| 普通话 | cmn-000 | 一次燃烧 |
| 普通话 | cmn-000 | 初次燃烧 |
| 普通话 | cmn-000 | 初级燃烧 |
| 普通话 | cmn-000 | 预燃 |
| English | eng-000 | pre-burning |
| English | eng-000 | precombustion |
| English | eng-000 | preflame |
| English | eng-000 | preignition |
| English | eng-000 | preliminary combustion |