These screws are metric.

　　這些螺絲釘是用公制尺碼制造的。

　　I can't get the screw to turn.

　　我擰不動這個螺絲釘。

　　The screw was so tight that it wouldn't move.

　　螺絲釘太緊，擰不開。

　　The screw had worked loose.

　　這螺絲釘松動了。

　　The screw is out of condition.

　　這個螺絲釘壞了。