例句與造句

1. Congress told the agency that it must be certain that pesticides would be harmless, and that in the case of children, it needed to have an extra 10-fold margin of safety.
2. :: However, there's no paradox here : although the probability of each individual event is vanishingly small, one of them " must " happen; it's a bit like winning the lottery-- although it's almost certain any given player won't win, if the prize is awarded, it must be certain that one player will win-- we just don't know which one.
3. It's difficult to find it must be certain that in a sentence. 用it must be certain that造句挺難的