界 joins 田 field with 介 jiè, which supplies the sound. Field boundaries give the first meaning, 'boundaries of a field.' It grew to 'boundary,' 'divider,' and 'to divide.'
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Example Sentences
这个哲学界有很多杰出的人物。
zhègèzhéxuéjièyǒuhěnduōjiéchūderénwù 。
There are many outstanding figures in this philosophical circle.