1) вспомогательное вещество; добавка
2) вспомогательное средство
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aids to approach — средства обеспечения захода на посадку;
aids to navigation — навигационные средства
- approach aids
- coding aids
- computer aids
- computer design aids
- computing aids
- deaf aid
- debugging aids
- diagnostic aids
- docking aids
- electronic teaching aids
- en-route navigation aids
- ether starting aid
- filter aid
- focusing aid
- ground aids
- hearing aid
- homing aids
- identification aids
- inert filter aid
- mechanical aid
- modeling aids
- navigation aids
- navigational aid
- out-of-position aid
- processing aid
- programming aids
- radio aids
- radio-navigation aids
- recovery aids
- short-range aids
- sintering aid
- starting aid
- taxiing guidance aids
- terminal navigation aids
- testing aids
- track-defining aids
- visual aids