[核 心 单 词]
expand v.膨胀;扩大;扩展
[经典例句]he was so eager to expand his farm that he did not notice the river flowing slowly towards his door.(2013·江西·阅读理解a)
他非常渴望扩大农场以至于他没有注意到河流慢慢地流向他的房门。
expand into (使……)扩大成……
expand in 在……方面增加/膨胀
expand on/upon 详述,详细阐明
①as helen's knowledge and vocabulary expanded, she asked more and more questions.
随着海伦知识和词汇量的增加,她问的问题越来越多。
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