American boy, 13, will try to climb Mount Everest In this Sept. 1, 2009 photo provided by the Romero family, Jordan Romero poses at the Carstensz Pyramid summit, Oceania's highest peak at 16,024 feet, making Jordan the youngest person to sum
从人类的自然发展来看,男孩的出生数量总是多于女孩,但据一项最新调查显示,美国和日本的男女出生数量差距在过去三十年中逐渐缩小。,新闻翻译