- total of degrees of difficulty
- 难度: degree of difficulty; diffic ...
- 总和: sum; total; totality; tale; ...
- 温度总和: accumulated temperature; summation of temperature; temperature sum; thermal sum
- 温度总和规律: temperature sum rule; temperature-sum rule; temperaturesum rulee
- 有效温度总和: effective accumulative temperature; total effective temperature
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