If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles.
如果对它们的数量进行时间记录，就会发现它是很不稳定的——以不规则的周期急剧上升下降。
The teen pregnancy rate was soaring, and the high school graduation rate was plummeting to record lows.
少女怀孕率上升。同时，高中学生的毕业率下降。
The teen pregnancy rate was soaring, and the high school graduation rate was plummeting to record lows.
少女怀孕率上升。同时，高中学生的毕业率下降。
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