例句1: One of our biggest sacred cows is the national social security program which pays many older Americans a pension. This program costs more money every year. But politicians are afraid to touch it because older folks have a lot of votes.
例句2: Laura takes great care of her health. She's been very careful about what she eats and spends an hour every morning doing exercises. This has become her sacred cow - nothing can change her schedule rain or shine.
例句3: Our congressman had been in Washington 20 years and thought we'd keep voting for him forever. This year, though, the other party nominated a dark horse out of nowhere. He kept telling voters it was time for a change and he won the election.
例句4: People tend to elect candidates who have big names. But after listening to the new candidate's speech, I think he makes a lot of sense. I'm going to vote for him even though he's a dark horse.