• The trace is so complicated that the observer may not be able to make sense ( or to make head or tail - col .) of it.
• This situation may be difficult to unravel .
• The trace is so complicated that the observer may not be able to make sense ( or to make head or tail - col .) of it.
• This situation may be difficult to unravel .
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012