Calculating the trajectory is difficult.

He is an expert in ethology.

It is thirty-three kilometers to my house.

We went on a trip using the expressway.

I maintain my health by doing aerobic exercises every day.

I am planning to go to Gangwon in Korea next week.

I ended up cohabiting with him.

I pray at the cathedral every day.

My new sneakers are very comfortable.

He succeeded in developing a charcoal-powered vehicle.