You guys who roll up your sleeves are so beautiful! Recently, the Shenyang 242 Hospital carried out blood donation activities, and 51 medical workers used love to “refuel” others’ lives. (Photographer: Zhang Wenkui) | 挽起袖子的你们真美！近日，沈阳二四二医院开展献血活动，51名医务工作者用爱心为生命“加油”。（摄影：张文魁）

【美国民主党正式提名拜登为总统候选人】The ongoing U.S. Democratic National Convention (DNC) on Tuesday voted to officially nominate Joe Biden as the party's presidential candidate.
Biden, already the presumptive nominee since April when all other contenders in the once crowded Democratic field dropped their bids, briefly addressed supporters from his hometown of Wilmington, Delaware, after a virtual presidential roll call.
"Thank you all from the bottom of my heart, from my family, and I'll see you on Thursday," he said, referring to his upcoming acceptance speech to wrap up the four-day convention.
The Democratic nomination entitled the 77-year-old former vice president to take on incumbent President Donald Trump of the Republican Party in the upcoming election scheduled for Nov. 3. (Xinhua)

去一个陌生的城市，搭上一辆公交车，隔着车窗和这座城市最美的建筑相遇。
P1：埃莫森学院，EMERSON LOS ANGELES
PHOTOGRAPH BY RAIMUND KOCH-VIEW, ALAMY STOCK PHOTO
P2:水之塔，AQUA TOWER
PHOTOGRAPH BY DANIEL BORRIS, THE NEW YORK TIMES/REDUX
P3：摇滚名人堂，ROCK AND ROLL HALL OF FAME（贝聿铭设计）
PHOTOGRAPH BY PHILIP SCALIA, ALAMY STOCK PHOTO
P4：费舍艺术图书馆，FISHER FINE ARTS LIBRARY
PHOTOGRAPH BY NAUM CHAYER, ALAMY STOCK PHOTO
P5：LOU RUVO脑健康中心，LOU RUVO CENTER FOR BRAIN HEALTH（弗兰克·盖里设计）
P6：国家非裔美籍历史文化博物馆，NATIONAL MUSEUM OF AFRICAN AMERICAN HISTORY AND CULTURE
PHOTOGRAPH BY MICHAEL VENTURA, ALAMY STOCK PHOTO
P7：彩虹街上的婚礼蛋糕屋，WEDDING CAKE HOUSE AND RAINBOW ROW
PHOTOGRAPH BY PETER FRANK EDWARDS, REDUX
P8：阿斯彭艺术博物馆，ASPEN ART MUSEUM
PHOTOGRAPH BY NIC LEHOUX, VIEW PICTURES/GETTY IMAGES
P9：密尔沃基艺术博物馆，MILWAUKEE ART MUSEUM
PHOTOGRAPH BY BURG + SCHUH, PALLADIUM/LAIF/REDUX