With low blood sugar, your can't make strong muscularcontractions.
血糖水平太低，你的肌肉无法收缩。
2
Foods and fluids are mixed in the stomach by its muscularcontractions.
通过胃部肌肉的收缩食物和流质在胃中混合。
3
"The muscularcontractions associated with fidgeting are really quite small," he said, "but it appears that they are sufficient" to combat some of the unhealthy consequences of sitting.