Hello, I'm a specialist in human anatomy and physiology. Let's dive into the function of the Zygomaticus major muscle.

The Zygomaticus major muscle is a flat, broad muscle that is located on the side of the face. It originates from the zygomatic bone, which is a part of the cheekbone, and it inserts into the skin at the corner of the mouth. The primary function of this muscle is to pull the corner of the mouth upward, which is essential for the expression of happiness or laughter. When you smile or laugh, the Zygomaticus major muscle contracts, lifting the lip and creating the characteristic upward movement at the mouth's corners.

Now, let's translate that into Chinese:

你好，我是人体解剖学和生理学方面的专家。让我们来探讨一下颧骨大肌的功能。

颧骨大肌是位于面部侧面的一块扁平而宽阔的肌肉。它起源于颧骨，颧骨是面颊骨的一部分，并且它插入到嘴角的皮肤中。这块肌肉的主要功能是将嘴角向上拉动，这对于表达幸福或笑声的表情至关重要。当你微笑或大笑时，颧骨大肌会收缩，提升嘴唇，并在嘴角处创造出特有的向上运动。

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The zygomaticus major is a muscle of the human body. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly to allow one to smile.read more >>