单词：activity cycle
activity cycle的用法和样例：
例句
- The author of the paper argued that scientific creativity depended on the phase of the solar cycle.报告人争辩说，科学创造力依赖于太阳活动周期的相位。
- The sun has a new spot, and it could signal the long-awaited beginning of the next solar cycle.太阳表面出现一个新的黑子，它可能标志着人们期待已久的太阳下一轮活动周期的开始。
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