美国航天局将于美国东部时间12月2日，星期四下午召开新闻发布会，讨论一个天体生物学的新发现，该发现将会影响外星生命存在的证据。
WASHINGTON — NASA will hold a news conference at 2 p.m. Est on Thursday, Dec. 2, to discuss an astrobiology finding that will impact the search for evidence of extraterrestrial life.
目前，时间生物学领域中许多处于领先地位的研究工作都是由国家航空和航天局资助的。
Much of the leading work in chronobiology is sponsored today by the National Aeronautics and Space Administration.
空间时间生物学是载人航天事业催生的一门新学科。
Space chronobiology is a new discipline born from the development of manned spaceflight.
单位：中国航天员科研训练中心航天细胞分子生物学实验室。
SETTING: Laboratory of Aerospace Cell Molecular Biology, Scientific Research Training Center for Chinese Astronauts.
1999年到2002年，他担任美国国家航空和航天局太空生物学研究所的管理者。
From 1999-2002 he was Director of the National Aeronautics and Space Administration (NASA) Astrobiology Institute.
文章简要阐述了空间辐射环境、空间辐射生物学效应与航天员的辐射剂量限值等问题。
The paper briefly introduces space radiation environment, biological effects of space radiation and limited absorbed dose bound to Astronaut in space activity.
文章简要阐述了空间辐射环境、空间辐射生物学效应与航天员的辐射剂量限值等问题。
The paper briefly introduces space radiation environment, biological effects of space radiation and limited absorbed dose bound to Astronaut in space activity.
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