He instinctively scratched his head when faced with a difficult problem.

He scratched his head when faced with a difficult problem.

He is bright, so he was able to solve the problem immediately.

His new yacht has a high-bow design.

Cephalopods are a type of marine life that includes squid and octopus.

The glans penis of a male is part of the erogenous zones, and is particularly known to be sensitive.

The moment I saw the exam questions, my mind went blank.

He trains his biceps at the gym every day.

He remembered the guillotine from the time of the French Revolution.

Polyarchy refers to a political system where many people share power.