Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.
North Korean(朝鲜)leader Kim Jeong-eun has sent urgent messages to world leaders Saturday, ________ that the United Nations’ decision on North Korea was ________.