well-kept

I was amazed at how well the hair kept its shape.

我发型保持得如此之好。

You'd better keep the two aggressive boys apart.

你最好把那两个好斗男孩分开。

I’m not sure about Johnson—we’d better keep tabs on him until we know we can trust him.

我对约翰逊不太放心——我们最好先观察他一段时间，直到我们确信可以信任他。