短语讲解：

1. They are not bound to the same rules or expectations as a full-time staff position.

be bound to 必然；一定要
例句：Each of the ports on the component will be bound to the appropriate role.
组件上的每一个端口都将被绑定到适当的角色。

2. These are benefits that were typically offered to full-time, permanent employees before the Great Recession of 2007-2009 led to fewer jobs.

lead to 导致; 把…带到; 领到
例句：He led us to a museum.
他把我们带到了一个博物馆。

3. And they are using them for a variety of professional positions.

a variety of 种种; 多种的
例句：People change their mind for a variety of reasons.
人们会由于种种原因改变主意。