a.

1. 费力的，吃力的
   Checking all the names was a slow, laborious job.

   核对全部名字是件既慢又费劲的事。

2. 勤勉的
   Ants and bees are laborious insects.

   蚂蚁与蜜蜂是勤劳的昆虫。

3. 牵强的；生硬的
   His books are written in a laborious style.

   他写书文笔艰涩。

adj.