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초음파의
약 344 미터 (바다 수준에서 초당 1130 피트) 소리의 속도 보다 더 빨리.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Convention
- Category: Conferences
- Company: CIC
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