Task: Translation
Input (English): The launch, which was scheduled for 3:51 ET (20:51 UTC), would have been the first launch of a shuttle since Columbia's February 2003 crash which killed all crew members aboard.
Output (Chinese): 这次发射计划在美国东部时间3点51分（UTC时间20点51分）进行，这将是自2003年2月哥伦比亚号航天飞机失事以来的首次航天飞机发射。