He felt it important to study the situation in Russia, so he began to learn Russian.
他感到研究俄国的形势很重要，因此他便开始学习俄语。
When Marx was already in his fifties, he found it important to study the situation in Russia.
当马克思五十几岁时，他发现研究俄国形势很重要。
In the 1870s, when Marx was already in his fifties, he found it important to study the situation in Russia, so he began to learn Russian.
年代，马克思已经五十几岁了，他觉得研究俄国形势很重要，便开始学习俄语。
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。
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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