在一些外国人看来，学习中文已成为他们最为头疼的事情。
In some foreigners eyes', the learning of Chinese has become the most difficult thing for them.
在一些外国人看来，学习中文已成为他们最为头疼的事情。汉语的语调和汉字好像都是个难题。那么到底是什么原因使中文这么难学的呢？
In some foreigners eyes', the learning of Chinese has become the most difficult thing for them. The tones of Chinese and Chinese characters all seem to be a difficulty.
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