fallow  
adjective uk/ˈfæl.əʊ/ us/ˈfæl.oʊ/
  (LAND)      
  休耕的
Fallow land is not planted with crops, in order to improve the quality of the soil.
  Farmers are eligible for government support if they let a certain amount of land lie fallow. 如果农民休耕一定面积的土地,他们就能获得政府资助。 
   (TIME)      
 (一段时间)休眠的,不活跃的
A fallow period of time is one in which very little happens.
  After a long fallow period, the author has brought out a new book. 沉寂了很长一段时间以后,这位作者推出了一本新书。