Wǒ zài tā de xìn zhōng dú chū le zìlǐhángjiān de bù'ān.
I read the unease between the lines of her letter.
Tips
history
From Liang dynasty Emperor Jianwen's preface 答新渝侯和诗书: 风云吐于行间，珠玉生于字里 ('wind and clouds emerge from the line spaces, pearls and jade are born in the characters').
mistakes
Note that 行 here is read háng (line/row), not xíng (to walk). Reading it as 'xíng' is the most common pinyin slip.
