安全气囊在碰撞时立刻膨胀，在司机和方向盘之间形成一个缓冲。
Airbags inflate instantaneously on impact to form a cushion between the driver and the steering column.
在接下来的几百万年间，盘状物中的几块粘在一起形成了现代太阳系所熟悉的八大行星。
During the next few million years, lumps of that disk stuck together to form the familiar eight planets of the modern solar system.
大约45亿年前，当太阳形成时，就被气体和尘埃的盘状物所围绕。
When the sun formed, some 4.5 billion years ago, it was surrounded by a disk of gas and dust.
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