[ C usually plural ] a sign of anger or disagreement不滿情緒;不滿的迹象
[ C usually singular ] a continuous low sound發出隆隆聲;發出辘辘聲;發出低沉連續的響聲
👨🏻🏫 Mr. Ng 劍橋詞典 📚 – cambridge.mister5️⃣.net切换为简体中文