He is spending a lot of time on experimental research.

That plan is too impractical, it's difficult to implement.

I'm troubled by his unproductive attitude.

He was affected by secondary effects.

He drew a hendecagon shape.

His party trick is perfect for livening up the party.

The First International was an international organization of workers.

His shoes are a symmetrical pair, perfectly matching left and right.

His painting expresses pure beauty.

Our project is scheduled to be completed on the eleventh day of the month.