выяснено, что
• It has been found (or established, or ascertained) that ...
• It turns out (or It appears) that in a wave guide the group velocity is equal to ...
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Русско-английский научно-технический словарь
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• It has been found (or established, or ascertained) that ...
• It turns out (or It appears) that in a wave guide the group velocity is equal to ...