Primary school enrolment will peak this year.

今年小学入学人数将达到最高峰。

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Not long ago, with the country entering a recessing and Japan at its prebubble peak, the U.S. workforce was derided as poorly educated and one of primary cause of the poor U.S. economic performance.

不久前，随着美国经济陷入衰退，日本正处于泡沫破灭前的高峰期，美国工人被嘲讽没有受过良好教育，并且被认为这是美国经济不景气的主要原因之一。

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However they are extremely useful if there is an unexpected peak in activity which results in all of the primary extents being filled (due to a long running unit of work for example).

不过，如果活动中出现了非预期的峰值而导致主扩展被用完(例如，由于出现了长时间运行的工作单元)，这就极为有用了。

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The rover's primary target is Mount Sharp, a peak about 8 kilometers (5 miles) away.

CNN: Mars rover could start moving in a week

Whether for everyday use as a primary power source, for use during periods of peak grid demand, or for backup use during emergencies, fuel cells offer an attractive, efficient and eco-friendly solution.

FORBES: Grid Problems Boost Fuel Cell Market

This may be the primary reason why Apple released the iPad Mini. iPad sales began to peak with the second-generation model.

FORBES: Did the iPad Mini Just Kill Off the iPad 4?