行星被认为是由围绕恒星旋转的气体和尘埃组成的圆盘中的粒子累积而成。
Planets are believed to emerge from the accretion of particles in a disk of gas and dust as they whirl around the star.
小小的成就会使您开心，累积而成就是大的成就。
Small little achievements make you feel good, and they add up to big achievements.
其次，大的成功其实是由无数小的成功累积而成的。
Secondly, large The success is the success of countless small accumulation.
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