为了获得有关唱歌能量消耗的经验数据，托马斯研究了鸣声率与雄性夜莺在夜间的体重变化之间的关系。

To obtain empirical data regarding the energy costs of singing, Thomas examined the relationship between song rate and overnight changes in body mass of male nightingales.

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这发生在（比方说）250 到 300 名用户之间，与之形成对比的是，在 300 到 350 名用户之间出现了非常陡的变化倾斜。

This occurs, for example, between 250 and 300 users, as compared to the steep slope of change for 300 to 350 users.

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首先，他们比较了在新旧两种会计制度下，收益变化与股价变化之间的关联性。

First, they compared how shifts in earnings correlated with shifts in share prices under the old accounting system and the new.

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And so, there is the distinction between fixed schedules versus ratios, variable schedules and ratio versus interval.

因此，在固定时程与变化时程之间,以及在比率与间隔之间，存在着一些区别。

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