He was affected by secondary effects.

This is a preliminary plan.

Thinking sensibly, that plan will not succeed.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.

He is thought to be a very unsociable person.

The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

We celebrate our wedding anniversary on the twenty-fifth day of the month.

The new project will start in seventy-five days.

The 正五胞體 is a simple convex polytope in four dimensions, having five vertices.