the state of being hard to do or to understand 是哪个词

the state of being Pollutionm_the state of being dirty补充单词 “the state of being dirty”是什么单词“the state of being dirty”是这个英文单词的解释,这个英文单词是什么? We should do something to stop the water ____(the state of being dirty) State of the Art the state of the state of art state of the state of the art the Secretary of State State of the art The decisive state of state-of-the It also has distinction of being the most multicultural state in the USA中为什么加‘being’? the state of being hard to do or to understand 是哪个词 the state of being poor 可以是哪个英语单词的解释? (the state of being well,free from illness)代表什么单词 the state of being dirty这里为什么要加一个being帮托谁来回答一下!为什么要用动名词形式呢？