定语从句的有关问题

In an experiment, pet owners are being encouraged to take their pets to work, a move that some scientists saycan be good for both the people and the pets.

这里的a move为何剖析为定语从句的主语呢？ 难道不是say的宾语吗？ 我感觉that some scientists say是move的定语？ 求老师解答疑惑。

In an experiment, pet owners are being encouraged to take their pets to work, a move that some scientists saycan be good for both the people and the pets.

参考译文：在一个实验中，宠物主人正在被鼓励携带他们的宠物去工作，一些科学家说这个举动对人和宠物都是有好处的。

a move that some scientists say can be good for both the people and the pets。 a move在定语从句中作宾语从句的主语。

等于“some scientists say that a move can be good for both the people and the pets”=一些科学家说这个举动对人和宠物都是有好处的。