Crop-growing skyscrapers摩天大楼 (第五段)

　　A major drawback of vertical farming, however, is that the plants would require artificial light. Without it, those plants nearest the windows would be exposed to more sunlight and grow more quickly, reducing the efficiency of the system. Single story greenhouses have the benefit of natural overhead light: even so, many still need artificial lighting. A multi-storey facility with no natural overhead light would require far more. Generating enough light could be prohibitively expensive, unless cheap renewable energy is available, and this appears to be rather a future assertion than a likelihood for the near future.

　　大作文常用词汇

　　be exposed to 暴露于

　　reduce the efficiency 降低效率

　　greenhouses 温室[可数]

　　have the benefit of 有好处

　　prohibitively expensive [费用]过分地贵

　　小作文常用词汇

　　nearest the windows：地图题中，名词后+nearest短语： The trees nearest the building are planned to be removed. 靠近楼的那些数会被挪走。far more: far用在形容词的比较级或最高级前表示程度：The consumption of beef was by far the most popular in 1979. 1979年的时候，牛肉的消耗量是最大的，并且远远大于其他。

　　句子仿写1

　　A major drawback of vertical farming, however, is that the plants would require artificial light.

　　在让步段段首，句子结构：A major drawback/benefit of sth, however, is that +完整句子. 例如：A major drawback of boarding school, however, is that parents lack communications with their children.

　　句子仿写2

　　Generating enough light could be prohibitively expensive, unless cheap renewable energy is available.换个单词：Generating enough power could be prohibitively expensive, unless cheap renewable energy is available后就可以直接用在环境类话题里面了。

　　句子仿写3

　　This appears to be rather a future assertion than a likelihood for the near future.这句话可以放在开头段做背景介绍，也可以放在结尾段。

　　重点词汇讲解

　　generate

　　意思很简单：引起、产生，注意搭配：generate electricity/ heat/ powergenerate income/ profitgenerate new ideas generate a lot of interest 引发很多关注