Melanie had forever cut off that line of action by her first words.

媚兰的头一句话就永远截断了她采取行动的途径。

But having committed herself to this line of action there was no retreating for bad weather.

但是，她既然已经采取了这个行动，天气再恶劣也没有退路了。

Now I think, Watson, that our line of action is perfectly clear.

现在我想，华生，我们的行动路线是非常清楚的。

The prudence of this line of action, indeed, was obvious; but, unfortunately, there was one very strong objection to its being adopted.

确实，这种做法的谨慎性是显而易见的。但不幸的是，有人强烈反对通过它。

Although muscle attachment points are conservative in living vertebrates, their positions and capabilities can vary because their lines of action change as the shapes, proportions, and orientations of the bones are modified in different groups of vertebrates.

尽管现存脊椎动物的肌肉附着点是保守的，但它们的位置和能力可能会有所不同，因为它们的作用线会随着骨骼的形状、比例和方向在不同脊椎动物群中发生变化而发生变化。