Guarding in the left lower quadrant.

左下腹肌卫。

As more damage is done to the tissue, patients experience pain in the left lower quadrant, which corresponds to the rectum.

随着组织损伤加重，患者会感到左下腹疼痛，这个位置对应的是腹腔内的直肠。

Making our way down, between the fourth and fifth rib, next to the left lower border of the sternum, is where you can best hear the tricuspid valve closing.

让我们往下看，在第四肋及第五肋之间，紧靠左胸骨下缘，你可以清晰听到三尖瓣关闭的声音。

She could have, because it's left lower side in abdominal pain, it could be something with her stool, she could have a lot of gas, she could have diverticulitis, obviously not so common in her age group.

她可能有，因为左下腹痛，可能是她的大便有问题，她可能有很多气体， 她可能有憩室炎，显然在她的年龄组并不常见。