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互いに， たがいに

1. mutually, with each other, reciprocally, together

相互, 彼此, 一起

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文通， ぶんつう

1. correspondence, exchange of letters

tbd

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彼ら， 彼等， かれら

1. they, them

tbd

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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

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する， 為る

1. to do, to carry out, to perform 2. to cause to become, to make (into), to turn (into) 3. to serve as, to act as, to work as 4. to wear (clothes, a facial expression, etc.) 5. to judge as being, to view as being, to think of as, to treat as, to use...

做，作，干，执行

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