Please be careful of his actual and hidden attitude.

He slipped his hand into his futokoro and pulled out a small notebook.

He entered the house from the back door.

He was fired from the company when it was discovered that he was involved in underhanded dealings.

He experienced the harsh reality of the underbelly of society.

Sexual exploitation is an absolutely unforgivable crime.

He likes to take a walk in the park at dusk.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.

The United Nations Environment Programme is providing solutions to global environmental problems.