其中一个问题是，《极地速递》中运用的面部表情捕捉系统无法捕捉眼睛的运动。
One problem was that the facial-capture system used in "the Polar Express" could not capture eye movements.
非语言交际包括语音质量，眼睛运动，面部表情和身体的动作，如手势和身体姿势的变化。
Nonverbal communication includes voice quality, eyes movement, facial expression and body movements such as gestures and change in body position.
面部表情往往可以被用来作为二次行动，以身体运动。
Facial expressions can often be used as secondary actions to body movement.
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