1) усилие
2) попытка
3) деятельность
4) исследовательская работа; мн. ч. исследования
5) мн. ч. трудозатраты
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- brake application effort
- braking effort
- continuous tractive effort
- crank effort
- design effort
- development effort
- gross tractive effort
- momentary tractive effort
- remolding effort
- retarding effort
- tractive effort