• In extreme cases over 30 tons of water have to be removed for each ton of coal mined.
• Under extreme conditions of temperature and pressure ...
• In extreme cases over 30 tons of water have to be removed for each ton of coal mined.
• Under extreme conditions of temperature and pressure ...
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012