通过键盘可设置：功率、测试时长、记录周期、电压下限、电压上限、导线内阻、操作模式、日期、时间等参数。

Power, test time, record period, voltage lower limit, voltage upper limit, lead internal resistance, operation model, data and time parameter can be set with keyboard.

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在这重要的一亿年的周期内缺乏化石（记录），关于这一点，有一种解释是早期的动物是软体动物，所以它们无法形成化石。

One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft bodied and simply did not fossilize.

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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。

If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles.

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