英语语法分析

Wolverton said he spent $500 on access codes for digital books and programs this semester.

沃尔弗顿说，这学期他花了500美元购买电子书和程序的访问码。

“Plants take substances out of the air through the tiny openings in their leaves,” Wolverton said.

“植物通过叶片上的小孔吸收空气中的有害物质，” 沃尔弗顿说。

"Plants take substances out of the air through the tiny openings in their leaves," Wolverton said.

植物通过叶片上的小孔吸收空气中的有害物质，沃尔弗顿说。