(Mosquitoes buzzing; pitch varies) HS: When I put them into the same hearing range, I noticed that they were kind of changing their tones.
(모기 앵앵거림; 주파수 다름) HS: 두 모기를 같은 범위에 놓으니까 두 모기가 소리의 음색을 약간 바꾼다는 것을 알아냈어요.