gobbledegook
noun [ U ] informal disapproving (also gobbledygook) uk/ˈɡɒb.əl.di.ɡuːk/ us/ˈɡɑː.bəl.di.ɡuːk/
（尤指公文用语中）复杂而无实质内容的语言，冗长而费解的文字；官样文章
language, especially used in official letters, forms, and statements, that seems difficult or to mean nothing because you do not understand it
This computer manual is complete gobbledegook. 这本计算机使用手册完全是本冗长的天书。