一篇介绍人造肉的文章中有一句话 Besides aquaponics, there is another way we could get around a future farmland shortage, we could build up, instead of out, this idea is called vertical farming, and it involves growing plants in stacked container, like on shelves or different flowers…
请教老师这句话中的副词up和out如何理解?其中built up是动词短语吗?我查词典上build up有增强增多的含义,可似乎又不太符合这里语境。在字典中就查不到build out的这么个短语形式了。
请教老师详细解释一下这里单词up和out的使用,最好再给出几个类似用法的例句来说明。