名詞 fieldwork:

1. a temporary fortification built by troops in the field

1. In those days they could not spare the children from fieldwork.
   那時(shí)候，孩子不到地里干活是不行的。

field.work

n.（名詞）
A temporary military fortification erected in the field.
野戰(zhàn)工事：在野外設(shè)置的臨時(shí)軍事防御工事
Work done or firsthand observations made in the field as opposed to that done or observed in a controlled environment.
現(xiàn)場(chǎng)工作：在實(shí)地所做的工作或獲得的第一手觀察資料，與在可控環(huán)境下做的或觀察到的東西相對(duì)
The collecting of sociological or anthropological data in the field.
野外考察：野外社會(huì)學(xué)或人類(lèi)學(xué)事實(shí)資料的收集

【引伸】
field.work.er
n.（名詞）