tā / fǎn / gōng / jiǎn / tǎo / zì / jǐ / de / jué / dìng / zhōng / yú / fā / xiàn / le / qí / zhōng / de / cuò / wù

他反躬检讨自己的决定，终于发现了其中的错误。

He reflected on his decision and finally found the mistake in it.