ध्वन्यास्त्र
dhvanyastr evan 'parashravyastr' (aangrezi: Sonic and ultrasonic weapons) ve hathiyar haian, jo shravy ya parashravy dhvani ka upayog karake apane shatru ko kshati pahuanchate haian ya mar dalate haian. ye hathiyar abhi simit upayog mean haian.
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