The extreme isolation of these massive farms leaves them often unattended, and monitored only once or twice a year, which means if the livestock falls ill or requires assistance, it can be a long time for farmers to discover.
2018年12月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
无人照料的；无人看管的
When people or things are left unattended, they are not being watched or looked after.