key item

The access tunnel project is the key item in the preliminary phase of the construction of Jinping Hydro-electric Plant.

锦屏水电枢纽工程是一项大型的水电工程，它的建设将为国家特别是西部的电力行业做出巨大贡献，该水电枢纽辅助洞工程是水电站前期工程的控制性关键项目。

Alpine skiing is the key item of business for us to develop winter tourism.

高山滑雪是我们这里开展冬季旅游的拳头项目.

The key thoughts of CCAR is that first it clusters items according to its cycle time distribution, partitions each item into several efficient time intervals by the clusters;

CCAR的核心思想是首先把各项目按照周期时间分布进行聚类，根据聚类结果把每个项目分成几个动态的有效时间区域。

The choice about proper control algorithms is the key item in designing damper semi-active control systems.

选择合适的控制策略是设计磁流变阻尼器 半主动 控制系统的核心问题.