She's in a horizontal or resting position.

她处于水平或休息的姿势。

It's to put something down in a resting position.

它是指把东西放在一个静止的位置上。

So 'lie' means be horizontal here, be in a resting position and the past form is lay.

所以 lie 在这里的意思是平躺，处于休息的姿势，过去式是 lay。

First of all, the position of Thrinaxodon's forelimbs, to the side of its skull, looks like a natural resting position.

首先，Thrinaxodon 的前肢在其头骨一侧的位置看起来像是一个自然的休息姿势。

Because with the scroll wheel on a mouse, your hand never had to leave its resting position, you just scroll to see the next thing.

因为有了鼠标上的滚轮，你的手永远都不必离开起始位置，只需滚动手指就能看到下面的内容。