The tail is fixed on the model plane with nails; it cannot come off.

模型飞机机钉子钉在飞机上, 不会掉下来。

We got a fix on the missile launching site.

我们确定了导弹发射场位置。

They fixed on him to speak on their behalf.

他们已经确定他作为代表发言。

His eyes are fixed on the red embers of the fire.

他眼睛盯着红色。