離(り)陸(りく) ririkuの no際(さい) saiは wa、シートベルト shiitoberutoを o締(し)め() shimeなくてはならない nakutehanaranai。 You must fasten your seatbelt during takeoff. Literal Takeoff [possessive-の] occasion [topic-は], seatbelt [object-を] must-fasten. 離陸の際は (during takeoff) uses 際 (さい, occasion/at the time of) — a formal time expression. シートベルトを締める (to fasten a seatbelt) is standard vocabulary. ~なくてはならない is the obligation pattern. travel
離(り)陸(りく) ririkuの no際(さい) saiは wa、シートベルト shiitoberutoを o締(し)め() shimeなくてはならない nakutehanaranai。 You must fasten your seatbelt during takeoff. Literal Takeoff [possessive-の] occasion [topic-は], seatbelt [object-を] must-fasten. 離陸の際は (during takeoff) uses 際 (さい, occasion/at the time of) — a formal time expression. シートベルトを締める (to fasten a seatbelt) is standard vocabulary. ~なくてはならない is the obligation pattern. travel