develop into与develop from
1. develop into意为“发展为……”。如：
The argument developed into a bitter quarrel. 这场辩论逐渐变成了激烈的争吵。
Their affair did not develop into a lasting relationship. 他们的暧昧交往未能发展成为持久的关系。
2. develop from意为“由……发展而成”。如：
Land animals are thought to have developed from seaanimals. 陆地动物被认为是从海洋动物进化而来的。
The place has developed from a fishing port into a thriving tourist centre. 这地方由原来的渔港发展成一个繁荣的旅游胜地。
比较：
Plants develop from seeds. 植物从种子长成。
Seeds develop into plants. 种子长成植物。
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