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wood material not sinking in water but iron material sinking also ship is not sinking why

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??????? ????????? ?????????????????????? ????????? ??? ????? ???????? ????????. ??????? ???????????? ????????? ??? ??????????? ?????????????????? ???????? ???????? ???????? ???????? ????? ????????? ?????????. ?????????????? ??????? ?????? ?????????????????? ??? ?????????????. ???? ????????????????????? ????? ??????? ??? ????????? ???????? ???? ???????? ????? ???????????????? ??????? ????????? ???????????????????. ???????? ???????????????? ??????? ????? ??????????????? ??????? ?????????????? ????? ????? ??????? ????? ????? ????????? ???????????. ???????? ??????????? ????????? ???????? ????????.


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