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• It was not until 30 years later that the study of these viruses became popular.
• It was another 17 years before the first engine was developed.
Источник:
Русско-английский научно-технический словарь
на Gufo.me
• It was not until 30 years later that the study of these viruses became popular.
• It was another 17 years before the first engine was developed.