訓 おも(う) ・ 音 ソウ,ソ
Sino-Vietnamese: tưởng
The part 相 (look at) over heart 心: seeing something and picturing it in your mind, so it means idea or thought (Han Viet tuong, as in tuong tuong = imagine).
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面白い発想ですね。 (おもしろいはっそうですね)
That is an interesting idea.