directly involved in the most active or dangerous part of something
何かの最も活発または危険な部分に直接関与している (nanika no mottomo kappatsu mata wa kiken na bubun ni chokusetsu kan'yo shite iru)
"Doctors were on the front line during the pandemic."
"パンデミックの間、医師たちはフロントラインにいました。" (Pandemikku no aida, ishi-tachi wa **furonto rain** ni imashita.)
success is almost attainable
to cite something exactly or in great detail
to persuade someone to join an activity
to reassure someone that they can handle a situation
to relax your vigilance or become less careful
In a position to be injured or in danger.