In recent years, however, some health specialists have begun to apply the terms "well" and "wellness" only to those who are actively striving to maintain and improve their health. (06.12 Passage 2)
主干：some health specialists have begun to apply...
主句部分，不定式to apply...用作begun的賓語。apply...to...表示“把......應用于......”，句中表示“把well和wellness這樣的詞只用來指那些人”。who引導的定語從句修飾those。
譯文：然而，近些年來，一些健康專家開始把“健康”和“健康狀況良好”這樣的字眼只使用到那些積極努力去保持并改善自身健康狀況的人身上。
