查询词典 may modal

If the number alternatives for the verb are both felt to be awkward, speakers may avoid making a choice by postponing the second noun phrase or sometimes by substituting a modal auxiliary.

就是说，谓语动词与第二个主语保持一致时有时会显得别扭，所以常常见到把第二个主语移到后面作为分句或采用情态动词的做法。

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。