topcoating

例句：

1. 1. The car was given a new topcoat to protect it from the sun's UV rays.
   汽车被涂上了一层新的顶层漆以保护它免受太阳紫外线的伤害。
2. 2. The chef applied a topcoat of oil to the meat before cooking it.
   厨师在烹饪前给肉上涂了一层油作为顶层。
3. 3. The painting was finished with a topcoat of gold leaf.
   这幅画最后涂上了金箔作为顶层。