[参考译文]基因专家、耶鲁大学博士后研究员朱衡是一名谨慎的分子生物学家。但去年4月,他却因为大意犯了一个错误。35岁的朱衡工作签证过期,他被迫回到中国等待美国国务院给他发出新签证。10个月过去了,虽然朱衡一再发信、打电话催促,且有耶鲁大学官员和其他支持者呼吁给他签证,他仍然在北京等待是否能回美国。他的缺席已经造成美国 A genetic expert and a postdoctoral researcher at Yale University, Zhu Heng is a cautious molecular biologist. However, in April last year, he made a mistake because of his big intentions. The 35-year-old Zhu Heng’s work visa expired. He was forced to return to China and wait for the US State Department to issue him a new visa. Ten months later, although Zhu Heng repeatedly wrote letters, called for urging, and Yale University officials and other supporters called him for a visa, he is still waiting in Beijing to see if he can return to the United States. His absence has caused the United States