For the first time in a long time, the recovery looks as if it might be starting to sputter a little bit.

Everywhere you look, after all, there has been less-than-stellar news recently. Consider the fact that the economy not only added a 75,000 jobs in May — 180,000 had been expected — but also that, after the latest revisions, it turns out it added 75,000 fewer jobs than we had thought in March and April. 

这里的jobs应该是字典中如下释义:

■a paid position of regular employment

职位，工作岗位

the scheme could create 200 jobs.

该计划可能产生200个工作岗位。

a part-time job.

兼职。

请问，老师，这里为什么有一个 a ?