单数

Use "a" or "an" with a singular count noun when you mean "one of many,""any,""in general."

一般规则：在表达一类中的一个时，在单数可数名词前用a或an

You can use "the" in front of any noun, whether it is a singular count noun, an uncount noun, or a plural count noun.

定冠词&the&是最常见的限定词。当所指的人物或事物双方都知道的时候可用&the&，它可用在任何名词前，包括单数可数，不可数名词，复数可数名词。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。