• Whether natural or man - made ( or artificial ), some of these trace substances occur as gases, others as aerosols.
• A man - made explosion ...
• Whether natural or man - made ( or artificial ), some of these trace substances occur as gases, others as aerosols.
• A man - made explosion ...
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012