She took a facesitting pose.

She has mastered the technique of facesitting.

This story is very strange, it's hard to understand.

Because of his color blindness, he has difficulty distinguishing between red and green.

The trolleybus is very convenient as a means of urban transportation.

He shook his head up and down.

He picked up the vajra staff and began to pray quietly.

He is overly self-conscious, always worrying about what people think of him.

The cricothyroid muscle is an important muscle for adjusting the tension of the vocal cords.

The thyroarytenoid muscle plays a crucial role in regulating the tension of the vocal cords.