inseparable
US
UK inseparable adj: figurative (friends: very close) (朋友)
SC 形影不离的，不能分开的 xíng yǐng bù lí de，bù néng fēn kāi de
My two cats are inseparable.
inseparable adj: (substances: cannot be separated) (物质)
SC 不可分的，不可分离的 bù kě fēn de，bù kě fēn lí de
Once you mix the salad dressing, the original ingredients become inseparable.