oil crust

• 油壳,固体油层

oil crust的用法和样例：

例句

1. Valuable deposits of oil have been found by drilling.
   通过钻探发现很有开采价值的油层。
2. Several smaller glands in the lids make the oil and mucus layers.
   眼皮上的一些小腺形成了油层和粘液层。