为什么保持平衡是keep healthy,保持平衡却是keep balance,healthy是形容词,balance是名词如题

为什么保持平衡是keep healthy,保持平衡却是keep balance,healthy是形容词,balance是名词如题 保持健康是keep healthy,keep+adj.,为什么保持平衡又是keep balance,keep+n.为什么不用keep balanced? 保持健康是 keep healthy还是keep health 保持健康是keep health 还是keep healthy? 为保持健康为什么用to keep healthy,不用keep healthy{放于句首}不要说的太复杂 keep healthy 为什么不用health? keep healthy,keep为什么可以改stay? keep是动词,为什么后面加形容词healthy keep you healthy 还是keep you to be healthy 为什么? 保持健康(英文短语)如何说啊我知道是keep healthy但是healthy是形容词啊这要是health吧,怎么会是healthy呢, 英文中：保持健康是 keep health 还是keep healthy?我看到有不同的答案.感激不禁! 到底应该是keep health还是keep healthy呢?如果是keep health又哪来的keep healthy这种说法?如果是keep healthy那为什么我在“知道”里看到How to keep health?这种句子呢? eat a balanced diet to stay healthy中的 stay healthy能不能替用keep healthy,不能的话,是为什么 如何保持心理健康(how to keep psychologically healthy) 如何保持心理健康(how to keep psychologically healthy) keep us healthy后面为什么用healthy还有us keep后面为什么可加healthy?形容词怎能用在动词后面?那么stay后面是接health还是healthy? 保持健康英文keep healthy=stay healthy还等于什么?