irregular service meaning in English

不定期航次
不定期航线
非定期运输线路

After again leaving marlott , her home , she had got through the spring and summer without any great stress upon her physical powers , the time being mainly spent in rendering light irregular service at dairy - work near port - bredy to the west of the black - moor valley , equally remote from her native place and from talbothays
在她再次离开马洛特村她的家后，整个春天和夏天她都是在体力上没有太大的压力下度过的，主要是在离黑荒原谷以西靠近布莱底港的地方做些奶场上的工作，那个地方离她的故乡和泰波塞斯一样的远。