well-kept

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

我惊诧于发型保持得如此之。

You'd better keep the two aggressive boys apart.

把那两个斗的男孩分开。

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——我们先观察他一段时间，直到我们确信可以信任他。