In the heart, action potential is moving from one heart muscle cell to another over the surface of the heart.

在心脏中，动作电位是在心脏表面从一个心肌细胞向另一个心肌细胞传递。

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Wave action applied pressure to the bottoms and sides, and the pressure propagated up through the ice to the surface.

海浪的作用力向其底部及侧部挤压，这股压力向上传递至冰山的表面。

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Wave action and the digging of nearby horseshoe crabs disturb many of the egg clusters, bringing them closer to the surface.

波浪作用和附近的马蹄蟹的挖掘，使一些卵群更接近沙滩表面。

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You're presented with a mixture of absolute and relative knobs across the surface -- smoothed action on the absolute, notched on the relative.

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