 |
| |||
| a large body of research; much research (much research has been done / conducted on electric propulsion systems; • much research in differential equations is directed toward refinement of these computer methods) | |||
|
многочисленные исследования : 2 צירופים, 2 נושאים |
| כללי | 1 |
| מקרוב | 1 |