beyond doubt
There is no doubt that the Chinese idiom pinyin is w ú K ě zh ì y í, which means that there is no doubt that the fact is obvious or the reason is sufficient. From the general history of China.
The origin of Idioms
Fan Wenlan's general history of China, part I, Chapter 5, Section 2: "in the Warring States period, some areas were able to make steel, no doubt."
Idiom usage
It's too formal to be doubted. example lesson 4 at the end of the eighth grade Zweig's "Lev Tolstoy" -- about this, hundreds of people, such as Turgenev and Gorky, have made undoubted description. There is no doubt that the Chinese table tennis team is strong and often wins the game.
beyond doubt
A scholar dies for a bosom friend - shì wèi zhī jǐ zhě sǐ