On Monday, my teacher Maggie told us about the climbing course, and my heart sank when I saw the wall.

星期一，我的老师麦琪给我们讲了攀岩课，当我看到那堵墙的时候，我的心一沉。

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The outermost layer of the wall of the heart is also the innermost layer of the visceral pericardium.

心壁的最外层也是心外膜的最内层。

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Electrical impulses in the myocardium, the heart's muscular wall, keep your heart beating.

包围在心脏外面的肌肉墙，也就是心肌层，里面的电脉冲让心脏保持跳动。

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Whereas LDL brings cholesterol to the artery wall, where it collects in heart attack-causing plaques, HDL carts it away.

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