1. The message to its home planet is barely halfway there.
    那么这个信号在发回到原来的行星途中刚刚走了一半路程。

2. It suddenly dawned on me that this express was not roaring down the line at ninety miles an hour, but barely chugging along at thirty.
    我突然感到这趟快车并没以时速90英里的速度呼啸前进，而是卟哧卟哧地向前爬行，时速仅30英里。