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| be in the dark; be in doubt about (what, whether); be ignorant of; have no knowledge of; be unacquainted with; be unaware of; be unaware that; be unconscious of; wonder | |||
| don't know; unknown | |||
| not known | |||
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| be a stranger to | |||
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| in complete ignorance of | |||
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| have no idea of | |||
| 不知道: 62 phrases in 10 subjects |
| Aviation | 1 |
| Business | 1 |
| Computer networks | 1 |
| Dentistry | 1 |
| Economy | 7 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 45 |
| International trade | 1 |
| Project management | 3 |
| Textile industry | 1 |
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