1. The intercalation of new materials greatly improved the performance of the device.
新材料的插入极大地提高了该装置的性能。

2. The book includes intercalations of photographs to illustrate key points.
这本书在关键点上加入了插图来说明。

3. The intercalation of a leap year is necessary to keep the calendar aligned with the solar year.
为了使日历与太阳年保持一致，必须进行闰年的插入。