flat leaf screw

例句：

1. 1. The carpenter used a flat leaf screw to hold the wooden planks together.
   木匠用一个平叶螺丝将木板固定在一起。
2. 2. The construction worker needs a flat leaf screw to tighten the bolts on the roof.
   建筑工人需要用一个平叶螺丝来紧固屋顶上的螺栓。
3. 3.The engineer designed a new flat leaf screw that can be easily adjusted for different sizes of bolts.
   工程师设计了一种新型的平叶螺丝，可以方便地调整以适应不同尺寸的螺栓。