my friends in australia said that chinese history was hard to understand
我在澳大利亚的朋友说，中国的历史很难理解
以上为机器翻译结果，长、整句建议使用 人工翻译 。
My friends in Australia said that Chinese history was very hard to understand .
我澳大利亚的朋友说中国历史很难理解。
My friends in Australia said that Chinese history was very hard to understand.
我澳大利亚的朋友们说中国的历史很难理解。
My friends in Australia said that Chinese history was very hard to understand, but I don't really agree.
我在澳大利亚的朋友说过中国历史很难理解，对此我不太同意。
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