have no illusion about meaning in English

对…不存在幻想

I have no illusions about it , but it must be done
我不否认，但是必须要有人做
I have no illusions about my ability , ie i know that i am not very able
我对自己的能力如何颇有自知之明（我知道自己的能力不很强）
But he had no illusions about the realities of his business : " there is no sense in making a film that no one will go and see , just to create a perfect , but useless , work of art , " he said
但是他对现实和自己的事业一直有着清醒的认识，他说：造一部无用而完美,没有观众想看的电影毫无任何意义
But he had no illusions about the realities of his business : " there is no sense in making a film that no one will go and see , just to create a perfect , but useless , work of art , " he said
但是他对现实和自己的事业一直有着清醒的认识，他说：去制作一部没有没有观众会来看的电影毫无任何意义，仅仅是去创造一部无用而完美的艺术品。