在过去的一个世纪中，传播通常需要6至9个月，即使在乘坐轮船或火车为国际旅行主要方式的时代也是如此。
In the previous century, this spread has typically taken around 6 to 9 months, even during times when most international travel was by ship or rail.
有些令人失望，他在标题为“要大胆前进：我在物理学中的生活”的发言中，没有提到那些热门的话题，诸如时间领域里的旅行或他在过去参加过辩论的外星人。
Disappointingly to some, his presentation, titled "to boldly go: My life in physics", made no mention of popular topics such as time travel or aliens that he has weighed in on in the past.
在过去的会议中，常听到批评宇航局是平价太空旅行的障碍，今年却鲜有所闻。
It was typical in the past to hear much bashing of the space agency as a barrier to affordable space access at this meeting, but there was very little of it this year.
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