In other cases, they are due to normal anatomical variations of the heart's shape and orientation.

其他情况下，它们是由于心脏形状和方向的正常解剖变异造成的。

The first is individual variation, which is the normal variation you see among individuals of any species, things like the exact shape of the antlers.

第一个是个体变异，这是你在任何物种的个体中看到的正常变异，比如鹿角的确切形状。