Crop-growing skyscrapers摩天大楼 (第六段)

　　One variation on vertical farming that has been developed is to grow plants in stacked trays that move on rails. Moving the trays allows the plants to get enough sunlight 注意这句：动名词做主语(moving the trays)，谓语动词+s(allows). This system is already in operation, and works well within a single-stored greenhouse with light reaching it from above: it is not certain, however注意这个词的的位置, that it can be made to work without that overhead natural light.

　　大作文常用词汇

　　allow sb to do sth 允许某人做某事

　　句子仿写

　　This system is already in operation, and works well within a single-stored greenhouse with light reaching it from above.

　　The public transport system is already in operation, and works well within city centre. 公交系统已经在使用中了，并且在市中心效果很好。

　　重点词汇讲解

　　variation1. 变化regional/ seasonal variation地区性/季节性变化2. 搭配介词on，注意英文解释：a thing that is different from other things in the same general group. 举例：The soup is a spicy variation on a traditional favorite. 这种汤是一种传统汤加了香料的改良。3.[音乐]变奏曲最后再来个例句吧：Her numerous complaints are all variations on a thing.这句话什么意思呢?用来修饰女生们喋喋不休的各种说一件事儿太合适了。

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