Because of the importance of nutrients and their scarcity, nutrient recycling is one of the most significant eco-system processes that we'll cover in this course.

由于养分的重要性和贫乏性，营养循环是我们在这门课中会讲到的最重要的生态系统过程之一。

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Chart 1 shows system reported battery levels over the course of one night, with the phone plugged in to a charger.

表1显示了手机连上充电器经过一晚上之后，系统记录的电量水平。

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No one likes sudden change, least of all system administrators (because they will get blamed if anything goes wrong, of course).

没有人喜欢突然的变化，所有系统管理员更是如此(因为如果任何事出错，他们理所当然地会受到责难)。

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One solution, of course, is upgrading to a 240-volt power system, which would cut charging time to about four hours.

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The survey results indicated that 70 percent of chemicals companies surveyed claim the ability to proactively manage spot shortages or oversupplies in their system, but this, of course, means that nearly one-third of companies in the industry are merely reactive, responding to supply imbalances as they occur.

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