名詞 undercurrent:

1. a subdued emotional quality underlying an utterance; implicit meaning
   同義詞：undertone
2. a current below the surface of a fluid
   同義詞：undertide

1. An underlying or implied tendency or meaning; an undercurrent.
   含意; 暗流; 內在性質隱含的或含蓄的傾向或意義; 潛在勢力
2. Therewas an undercurrent of resentment in their acceptance of the plan.
   他們接受該計畫時心懷不滿。