降级有好几个原因，就像拼图有好多拼板那样。
There are several reasons for that - it's a puzzle with many pieces.
所有这些步骤就像拼图游戏中一块块拼板，它们要全部拼在一起才能组成一幅图。
All those steps are like pieces of a puzzle. They all come together to form a picture.
所有这些步骤就像拼图游戏中一块块拼板，它们要全部拼在一起才能组成一幅图。
All those steps are like pieces of a puzzle. They all come together to form a picture.
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