through hole plating

例句：

1. 1. The through-hole plating on the bolts isdesigned to prevent corrosion.
   螺栓上的通孔镀层设计用来防止腐蚀。
2. 2. Thethrough-hole plating on the gears helps to protect them from wear andtear.
   齿轮上的通孔镀层有助于保护它们免受磨损。
3. 3. The through-hole plating on the shaft provides a strong anddurable surface for the bearings.
   轴上的通孔镀层为轴承提供了坚固耐用的表面。