立彬の日本語
彼らは何年もの間お互いに連絡していた。
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They communicated with the Western countries.
500
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何年， なんねん
1. how many years, how long
2. what year
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お互いに， おたがいに
1. mutually, with each other, reciprocally, together, both
相互, 彼此, 相互, 一起, 两个都
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連絡， 聯絡， れんらく
1. contacting, (making) contact, getting in touch, communication, correspondence, call, message
2. connection (with a train, bus, etc.), joining (a railway line, etc.), meeting
3. connection (between matters, incidents, etc.), relation, link
联络
彼ら， 彼等， かれら
1. they, them
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は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
もの， もん， モノ， 物
1. thing, object, article, stuff, substance
2. one's things, possessions, property, belongings
3. things, something, anything, everything, nothing
4. quality
5. reason, the way of things
6. used to emphasize emotion, judgment, etc., used to indicate ...
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