... cut-throat competition割喉式竞争;恶性竞争 cycle of activity活动循环;商业循环 cyclical fluctuation周期性波动 ...
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通常情况下,动物每天内部产生的活动循环继续保持不变。
Typically, the animal's daily internally generated cycle of activity continues without change.
这些“选择”只说明了一点:我们的每一天成为了永无休止的活动循环。
All those choices add to the idea that our days are never-ending cycles of activity.
太阳活动的周期为十一年,在这个周期里太阳活动包括太阳黑子、耀斑、磁场活动循环起伏。
Activity on the sun goes through cycles lasting about 11 years during which sunspots, flares and magnetic activity rise and fall.
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