口13. theory n D a formal idea or set of ideas that is intended to explain sth D E. g. Einstein formulated the theory of relativity in 1905
13. theory n. a formal idea or set of ideas that is intended to explain sth. E.g. Einstein formulated the theory of relativity in 1905
口14. harmony n o 1) pleasant combination of different notes of music played at the same time OE.g. The kids are singing in harmony o 2) a state or condition of agreement, cooperation, or peacefulness DE.g. Since they moved to this community they have lived in harmony with their neighbours
14. harmony n. 1) pleasant combination of different notes of music played at the same time E.g. The kids are singing in harmony. 2) a state or condition of agreement, cooperation, or peacefulness E.g. Since they moved to this community they have lived in harmony with their neighbours