In fact, it went into operation on December 20th, 1983.

事实上 它是在1983年12月20日投入使用的。

A new version of the GFS went into operation on January 14th, and two weeks later it passed with flying colours.

1月14日，升级后的全球预报系统投入运行，仅两个星期后它就斩获成功。