Crop-growing skyscrapers摩天大樓 (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 注意這句：動(dòng)名詞做主語(moving the trays)，謂語動(dòng)詞+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注意這個(gè)詞的的位置, that it can be made to work without that overhead natural light.

　　大作文常用詞匯

　　allow sb to do sth 允許某人做某事

　　句子仿寫

　　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. 公交系統(tǒng)已經(jīng)在使用中了，并且在市中心效果很好。

　　重點(diǎn)詞匯講解

　　variation1. 變化regional/ seasonal variation地區(qū)性/季節(jié)性變化2. 搭配介詞on，注意英文解釋：a thing that is different from other things in the same general group. 舉例：The soup is a spicy variation on a traditional favorite. 這種湯是一種傳統(tǒng)湯加了香料的改良。3.[音樂]變奏曲最后再來個(gè)例句吧：Her numerous complaints are all variations on a thing.這句話什么意思呢?用來修飾女生們喋喋不休的各種說一件事兒太合適了。

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