With low blood sugar, your can't make strong muscular contractions.

血糖水平太低，你的肌肉无法收缩。

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Foods and fluids are mixed in the stomach by its muscular contractions.

通过胃部肌肉的收缩食物和流质在胃中混合。

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"The muscular contractions 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.

“抖腿所带来的肌肉收缩其实很微小，”帕迪利亚说，“但现在看来，这已经足够”对抗久坐带来的一些健康问题了。

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They also want to include specialized tissue, so that the creature can activate the muscular contractions internally, as a real jellyfish does.

WSJ: Jellyfish Hints at Fix for Damaged Hearts