The path crossing this mountain is steep.

I should have regretted this mistake.

His figure suddenly appears.

The population of this town is increasing year by year.

Sexual abuse is an act that is absolutely not allowed.

I learned an algorithm to calculate the inverse matrix.

His team achieved a comeback victory at the last moment.

His team pulled off a come-from-behind victory in the last five minutes.

His rule was the epitome of evil tyranny.

Reverse Polish notation is one method of expressing calculations.