So we'll want both feet flat on the floor.

所以我们要把双脚平放在地板上。

Your knees should be at a right angle with your feet flat on the floor.

你的膝盖应在正确的角度 且脚掌平放接触地面。

They found that the bone structure of its back limbs probably meant that Ichthyostega couldn't put its feet flat on the ground, and that they were more like paddles.

他们发现， 其后肢的骨骼结构可能意味着鱼石螈无法将脚平放在地面上，它们更像是桨。