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This [paper](http://ypir.lib.yamaguchi-u.ac.jp/bg/metadata/1055) discusses how
どうも is used. On page 216, the following sentence shows up.

> 「どうも」は、これらの文表現において、一話部をになっている。

文表現 here refers to the expressions, "Thank You" "Sorry" "Excuse Me" "thank you
for coming" "sorry to take your time" "Hello" and "Goodbye". I am having a
hard time figuring out what 一話部 means. I'm guessing it means "part of a
sentence", but am not sure.

Does 一話部をになっている mean that the word どうも is a part of those sentences in
Japanese? Or simply that it carries the meaning of some of those expressions?
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question
word-usage parsing
What does 一話部 mean?
I think it's `一` "one; certain" followed by `話部` "speech (fragment); a part of
spoken sentence; phrase". 話部 is a rare word, but I don't think there is a
meaning more profound than what the kanji suggest. This 一話部をになっている should mean
どうも functions as a part of a longer sentence (rather than functioning as a
single-word sentence like "Hello!" or "Thanks!").
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answer