可以从简单的开始，然后逐渐进行复杂的配置。
You may want to begin simply and then work up to more complex configurations.
一些科学家认为，地球上的生命是逐渐进化的。
Some scientists suggested that there had been a gradual evolution of life on earth.
一些科学家认为，地球上的生命是逐渐进化的。
Some scientists suggested that there had been a gradual evolution of life on earth.
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