milch cow

基本解释

They are becoming the milch cow of the family.
他们将成为家庭的财源。
Milch cow industry is one of important part of dairy industry, including breeding milch cow , raising milch cow , preventing and cure of the epidemic disease and milk production.
奶牛业是奶业系统的一个重要组成部分，主要包括奶牛培育、奶牛饲养、疫病防治和原奶生产四个环节。
Meanwhile using artificial soil technology we can renew and improve the quality of our existing grassland and will build new and high quality rangeland and popularize good milch cow.
应用人造土壤技术，在恢复与提高已有草场质量的同时，还要新建一批高质量的牧场，我们再推广良种奶牛。

It is also dawning belatedly on the Treasury that the days of treating transport as a convenient milch cow are coming to an end.
ECONOMIST: Transport