• Fire is of infrequent occurrence ( or is rare , or rarely occurs ) on the major deserts.
• This is seldom the case .
• Fire is of infrequent occurrence ( or is rare , or rarely occurs ) on the major deserts.
• This is seldom the case .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012