main landing gear
/ˈmeɪn ˈlandɪŋ ˈɡiə/
n
English · main landing gear中文 · 主起落架Español · tren de aterrizaje principalFrançais · train d’atterrissage principal
意味：Retractable mechanism that enables the aircraft to land; it is located behind the aircraft’s center of gravity under its wings.