с тех пор
Since then, ever since, from then on, after that с тех пор как, с той поры как — (ever) since, since/from the time that thereafter;since then
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Полный русско-английский словарь
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Since then, ever since, from then on, after that с тех пор как, с той поры как — (ever) since, since/from the time that thereafter;since then