develop的名词怎么写

　　They had laid the groundwork for future development.

　　他们为此后的发展奠定了基础。

　　The central plank of the bill was rural development.

　　这一法案的核心是农村发展。

　　Scores of U.S. companies farm out software development.

　　许多美国公司外包软件开发。