2.2.3 Mermaid 类图（classDiagram）
Consider a mass on a spring.2 There are known equations for predicting the behavior of a mass (like a smooth block) sliding on a table. Such systems are well studied and the resulting equations of motion depend on only a few variables: the slope of the table, its roughness, the spring constant, etc..
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NYT Pips hints, answers for March 7, 2026，这一点在手游中也有详细论述
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