螺母不太紧，再拧一下吧。
The nut isn't tight enough yet: give it another screw.

这包应装有十个螺丝钉，可是短了两个。
This packet is supposed to contain ten screws, but it's two short.

我无法把这颗螺丝钉从墙上取出。
I can't get this screw to come out of the wall.

耳蜗是内耳里螺旋状的部分。

蜗牛壳是螺旋形的。
A snail's shell is spiral in form.

这张桌子的腿是用螺丝固定在地板上的。
The table legs are screwed to the floor.

这螺丝钉需要再拧紧些。
This screw needs tightening.

一只螺丝松了。
One of the screws is loose.