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| significant difficulties (reverso.net kee46) | |||
| formidable difficulties | |||
| more high accuracy still seems to involve considerable difficulties | |||
| considerable complexity (ssn) | |||
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major issue (Allen detailed some of the limitations of film cameras and how lighting would have been a major issue for the astronauts to overcome on the lunar surface. In order to light a backlit object in shadow, such as an astronaut descending the lunar lander, there must be a secondary source of light, a flash or reflector, which they did not have with them, he explained. – преодолеть такую значительную трудность, как уровень освещённости  coasttocoastam.com ART Vancouver) | |||
| значительные трудности: 4 phrases in 3 subjects |
| General | 1 |
| Makarov | 1 |
| Programming | 2 |