Birch Oil: a liquid ester with a strong odor of wintergreen; applied externally for minor muscle and joint more info discomfort. ??????? ????????? ? ???????? ??????? ??? ???? ?? ?????? ??? ??? ??? ? ?? ????? ????? ??? ??? ??? ???? ??? ??????? ???? ??? ? Her contributions make sure that readers acquire authoritative and culturally nuanced insights