中英释义：
双语例句
通货膨胀的老大难问题仍然困扰着他们.
The old bugaboo of inflation still bothers them.
首先，从汉语语言学研究的角度看，词类问题也一直是一个老大难问题。
On the one hand, POS study is always a Gordian knot to Chinese linguists ever since the beginning of Modern Chinese Linguistics.
重点词汇
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老大难
longstanding and difficult; chronic and tough; persistent and challenging; entrenched and problematic; longstanding problem; chronic issue; persistent difficulty; tough nut to crack
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问题
question; problem; issue; matter; subject; trouble; point; query; conundrum; woe; rub; snag; shauri; Q; problematic; questionable; problematical; debatable