如果肌肉收缩，色袋就会膨胀，你就会看到不同的颜色。

If the muscle's contract, then the sack expands, and you can see the colors.

youdao

如果肌肉收缩，色袋就会膨胀，你就会看到不同的颜色。

If the muscle's contract, then the sack expands, and you can see the colors.

youdao