You can't have too much of a good thing.

见好就收吧，你不可能太走运了。

It's just that you don't want too much of a good thing.

只是你不想要太多好东西。

Both are necessary, but it can be too much of a good thing.

两者都甚为必要，但是太多不一定是好事。

He coined the phrase you can have too much of a good thing.

他用短语杜撰了这样的表达—你能够从一个好的事物中得到许多好的东西（启示或启迪）。

Sunlight may be the best disinfectant, but there can be too much of a good thing.

阳光或许是最好的消毒剂, 但凡事过犹不及.

The only thing negative here is that you may have too much of a good thing or you are overly self-indulgent.

这个相位唯一的负面影响是，你可能会过于乐观或放纵。

Too much of a good thing can have a serious impact on your waistline -- and your health.

摄入过多的健康食物也会严重影响你的腰围和健康。

Too much of a good thing can be a bad thing, and in this hypothetical case, it would so bad that no one would survive.

物极必反，在这个假设的情况下，没有人能活下来。

Yet it’s also becoming clear that too much of a good thing can have a downside for the environment.

但是有一点越来越清晰：好东西太多了也会对环境产生负面影响。

Animations and sounds, used well, can heighten interest, but don't distract the audience with too much of a good thing.

动画和声音特效如果用得好的话，会让演讲变得有趣而生动，但即便是再好的东西，如果用得太多，也会让观众应接不暇。