effort
We make no effort to ascertain their parentage.
Мы не пытаемся выяснять их родословную. - to make an effort
We must believe in it and spare no effort towards its realization.
Мы должны верить в нее и не жалеть усилий для ее реализации. - to spare no effort
Its content does not require too much effort.
Его содержание не требует чересчур больших усилий. - to cost somebody much effort to do something