at the plenary sessions of both houses 意味

• 衆参両院本会議｛しゅうさん りょういん ほん かいぎ｝で
  

• interpellation at plenary sessions of both diet chambers:    衆参両院本会議｛しゅうさん りょういん ほん かいぎ｝での代表質問｛だいひょう しつもん｝
• joint plenary meeting of party members of both houses of the diet:    {組織} : 両院議員総会
• both houses of parliament:    both houses of parliament両議院りょうぎいん