They are senior students.
他们



生。
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But metaphors can also be misleading: picturing the atom as a solar system helps young students of chemistry, but the more advanced learn that electrons move in clouds of probability, not in neat orbits as planets do.
但比喻也可能具有误导性:把原子想象
一个太阳系有助于低年级化学学生的
解,但高年级的学生会了解到,电子在充满概率性的迷雾中运动,而不是像行星那样在规整的轨道上运动。