由于感情上的原因，我想把启程时间推迟到1980年6月。
For sentimental reasons I wanted to delay my departure until June 1980.
布什和家人有时间为离开而做好事先准备，他们大部分装书和衣服的箱子已经启程运往德州。
The Bushes have had time to prepare for leaving, and most of their boxes of books and clothes have already departed for Texas.
唯一可能且合理的解释是：一个被称之为“精细结构常数”或α的物理常数，在临近启程的那段时间产生了一个不同的值。
The only feasible explanation was that a constant of physics called the fine structure constant, or alpha, had a different value near the time the light started its journey.
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