Their eyes met for a moment.
2人の目が一瞬合った
Their first song didn't go over.
彼らのデビュー曲はヒットしなかった
Their marriage is heading for the rocks.
彼らの結婚生活は破綻寸前だ
Their marriage was over.
彼らの結婚生活に終止符が打たれた
Their names are absent from our list.
彼らの名前がリストにない
their native tongue
彼らの自国語
their own home
彼らの自宅
Their politics are unusual.
彼らの政治のやり方はふつうではない(◆形容詞・描写的な語を伴うときは複数扱い)
Their questions came thick and fast.
彼らの質問は矢つぎばやで数も多かった
their relationship with each other
彼らのお互いの関係