directly involved in the most active or dangerous part of something
непосредственно вовлечён в самую активную или опасную часть чего-то (neposredstvenno vovlyuchyon v samuyu aktivnuyu ili opasnuyu chast' chego-to)
"Doctors were on the front line during the pandemic."
"Врачи были на передовой во время пандемии." (Vrachi byli **na peredovoy** vo vremya pandemii.)
an exceptionally smart system created by humans
to cause complete failure in a system or process
the conflict between different cultural, religious, or civil...
in a risky or dangerous situation
a complex and interconnected web of thoughts or concepts
to pay attention to small details or finalize things perfect...