If you have the left femur from a specimen, you don't need the right to know its dimensions.

如果你有一块左股骨标本，你不去找右股骨也能知道它的大小。

No, in 1990 I had a motorcycle accident which destroyed my left femur.

司机：不，1990 年我发生了一场摩托车事故，导致我的左股骨受损。

In this case, the left femur.

在这种情况下，左股骨。

I've got a 12-inch plate, 10 screws and two pins that hold my left femur together.

我有一块 12 英寸的板、10 个螺钉和两个销钉，用于将我的左股骨固定在一起。

Because each animal only has one left femur, we know that every one we find represents another animal.

因为每只动物只有一个左股骨，我们知道我们找到的每一个都代表另一只动物。