核心问题
我总是搞不清 nothing but 与 anything but 的含义。
词典解答
nothing but 意为“只有”“只不过”，是肯定其后的事物或性质，而 anything but 意为“根本不是”，则是对其后的事物或性质的全面否定。
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She could see nothing but his head... 她只能看见他的头……
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Don't have him for a friend: he's nothing but a criminal. (LDCE) 不要把他当作朋友:他只不过是罪犯而已。
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I will do anything but that. 我绝不干那样的事。