To understand how this might happen with moons, first imagine a bowling ball as it rolls down an alley.
要理解月球上是如何发生的,首先想象一下一个保龄球在球道上滚动。
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The alley was built in 1962 and all its equipment is original, with an exuberant use of steel that you don't see anymore: long, shiny Brunswick ball racks, dining tables with heavy flared legs.