很多人会训练几个月来增强耐力，然后再去跑马拉松。

Many people train for months to ___build endurance before running a marathon.

他们正在建造一座新桥来连接河的两岸。

They are ___building a new bridge to connect both sides of the river.

定期锻炼可以帮助你逐渐建立自信。

Regular exercise helps you gradually ___build self-confidence.

教授花了很多年时间来构建这个理论框架。

The professor spent many years ___building this theoretical framework.