At transonic speeds (near the speed of sound), it helps to comb the wing backwards or forwards to reduce drag from supersonic shock waves as they begin to kind. The swept wing is just a straight wing swept backwards or forwards. طبیعتا در این ایام سفرهای جاده‌ای خسته‌کننده خواهند بود https://zander7uq86.eedblog.com/27333907/top-latest-five-ملک-urban-news