1. The rotascope is commonly used in animation to create smooth and accurate movement.
使用旋转镜片在动画中常常可以创造出流畅而准确的运动。
2. The filmmaker used a rotascope to trace the motion of the actor and incorporate it into the animated scene.
电影制作人使用了旋转镜片来追踪演员的动作，然后将其融入到动画场景中。