| English | Russian |
| basic original, но не initial equation | исходное соотношение (relation) |
| basic original, но не initial equation | исходное уравнение (relation) |
| basic equation | основное уравнение |
| derivation of basic equations | вывод основных уравнений |
| relation 4 may be referred to as the basic equation of airborne gravimetry | называть |
| the basic equation | основное уравнение |
| the basic point is that the initial equation can be approximated in the form | главная идея |