Something laborious takes a lot of time and a lot of effort. A laborious job is the long grind: copying a hundred pages by hand, picking stones from a field, filling in forms one line at a time. It describes the work, not the person doing it.

Something laborious takes a lot of time and a lot of effortlaborious的東西要花很多時間和很多力氣。A laborious job is the long grind辛苦的laborious工作就是那種漫長磨人的活：copying a hundred pages by hand像是用手抄一百頁、picking stones from a field在田裡撿石頭、filling in forms one line at a time一行一行填表格。It describes the work, not the person doing it它形容的是這件事本身，不是做這件事的人。

Though actually, it can also describe a way of doing something that feels too slow and too careful — a laborious explanation that takes forever to reach a simple point.

Though actually, it can also describe a way of doing something that feels too slow and too careful不過其實，它也可以形容一種做事方式，感覺太慢又太仔細——a laborious explanation that takes forever to reach a simple point像是一個要花老半天才講到重點的laborious解釋。

It is a little formal; in ordinary talk people more often say “a lot of work” or “really time-consuming”.

It is a little formal這個字有點正式；in ordinary talk people more often say "a lot of work" or "really time-consuming"日常說話比較常說「a lot of work」或「really time-consuming」。

It is not the same as labour-intensive, which is about needing many workers, and it is not a spelling of laborer, which is a person.

It is not the same as labour-intensive它跟labour-intensive不一樣，which is about needing many workers後者指的是需要很多工人，and it is not a spelling of laborer而且它也不是laborer的另一種拼法，which is a personlaborer指的是「人」。