他在演讲中引用了一句古诗，却因为提笔忘字，想不起其中一个字怎么写。
He quoted an ancient poem in his speech, but because he had difficulty remembering how to write characters, he could not recall how to write one of them.
He quoted an ancient poem in his speech, but because he had difficulty remembering how to write characters, he could not recall how to write one of them.