1. 如果用名词prevention的话，整个句子的重心就变了，aim at the prevention 而不是aim at preventing ... (这件事)
2. prevent sth or prevent sb from doing sth
destroying an elderly patient变成了修饰的内容，原句的意思是防止illness destroy 老人，这里只是防止illness，这个illness会destroy老人。
The large volume of transactions associated with these activities seems to have necessitated hierarchical management structures well before the advent of modern communications and transportation.
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1. 如果用名词prevention的话，整个句子的重心就变了，aim at the prevention 而不是aim at preventing ... (这件事)
2. prevent sth or prevent sb from doing sth
destroying an elderly patient变成了修饰的内容，原句的意思是防止illness destroy 老人，这里只是防止illness，这个illness会destroy老人。