I have been to the Congo.

She is good at playing the konghou.

He went to the mountain to search for gold.

This ring is made of high-quality alloy.

I stopped the car because the yellow light came on.

The green traffic light came on, so I crossed the road.

He crossed the road ignoring the red light.

He is an expert in cryptography and is involved in the development of security systems.

He pursued the path of Zen and finally achieved enlightenment.

After many years of training, he finally entered a stage of enlightenment.