You may have heard this expression: You can lead a horse to water, but you cannot make him drink. That means you can give someone advice but you cannot force him to do something he does not want to do.

你可能听过这样一句老话：牵马河边易，逼马饮水难(You can lead a horse to water, but you cannot make him drink)。意思是你可以给人建议，但你不能强迫他们做不想做的事情。

Sometimes a person fights a battle that has been decided or keeps arguing a question that has been settled. We say this is like beating a dead horse.

有时，某人可能就一个已有定论的问题争论不休。我们说这简直就是徒劳无益白费口舌(beating a dead horse)。

In politics, a dark-horse candidate is someone who is not well known to the public. Sometimes, a dark horse unexpectedly wins an election.

在政治上，黑马(dark-horse)候选人是指不为公众熟知的人。有时，黑马会出人意料地赢得选举。

Another piece of advice is, do not change horses in midstream. You would not want to get off one horse and on to another in the middle of a river. Or make major changes in an activity that has already begun. In the past, this expression was used as an argument to re-elect a president, especially during a time when the country was at war.

另一个建议是，不要临阵换将(do not change horses in midstream)。你肯定不希望在河中央时再换骑另一匹马，也不希望在事情已经开始后再做重大改变。在过去，人们常用这条习语来论证不要重选总统，尤其是国家处于战争期间时。

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