In the 1870's when Marx was already in his fifties, he found it important to study the situation in Russia, so he began to learn Russian.

在十九百年七十年代当马克思已经半百多岁时，他发现研究俄国的形势很重要，便开始学习俄语。

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In the 1870's when Marx was already in his fifties, he found it important to study the situation in Russia, so he began to learn Russian.

在十九百年七十年代当马克思已经半百多岁时，他发现研究俄国的形势很重要，便开始学习俄语。

youdao