- fortuitous changes
- 偶然: accidental; fortuitous; casu ...
- 的: 4次方是 The fourth power of 2 i ...
- 变动: change; alteration; oscillat ...
- 偶然的: accidental; adventitious; aleatory; by accident; casual; causeless; facultative; fortuitous; incidental; occasional; odd; random; scratch; stochastic; tangential; throwaway; unpremeditated
- 偶然的；偶然；不规则: haphazard
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