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contra-rotating
hFarsi - advanced version
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contra-rotating
علوم هوايى :
دو يا چند ملخ يا شفت که درخلاف جهت هم روى محور مشترکى ميچرخند و بدين ترتيب مانع اثر نيروهاى پيچشى ميشوند