图片文件尺寸 : 1924 x 3000px
“国家卫生研究院帮助他人-National Institutes of Health
Reaching out to help others–National Institutes of Health (美国, 1887-)
图片文件尺寸 : 1924 x 3000px
“国家卫生研究院帮助他人-National Institutes of Health
Reaching out to help others–National Institutes of Health (美国, 1887-)