Jimmy Carter － the 39th president of the United States － has marked a new milestone as the oldest living former president ever.
On Friday, Mr. Carter reached the age of 94 years and 172 days, becoming the longest-living president in U.S. history. He passed the previous record held by the late President George H.W. Bush, who died Nov. 30 at the age of 94 years, 171 days.
In 2015, Carter announced doctors had discovered a form of melanoma that spread to his brain. He received his first radiation treatment at 90 years old. Four months later, he said he was cancer-free.
Carter, who served in the White House from 1977 to 1981, was just 52-years-old when he assumed the Oval Office. His participation in Carter Center programs in global peace earned him a Nobel Peace Prize in 2002.
melanoma：名詞，黑色素瘤（皮膚癌的一種）。例句：Melanoma is a deadly type of skin cancer associated with sun exposure.（黑色素瘤是一種致命皮膚癌，與陽光曝曬有關。）
-free：字尾，無…的、免費的。例句：No working environment is entirely stress-free.（沒有工作環境是完全無壓力的。）
assume：動詞，掌管（權力）、承擔（責任）。例句：The prince assumed power when he was only fifteen.（王子在15歲時就已掌權。）