外接圆

• 夕(evening; crescent moon (pictographic))RADICAL
• 卜(divination; fortune-telling)PHONETIC

Evening outside divining fortunes under the moon — that's an external affair.

• 扌(hand; arm)RADICAL
• 妾(concubine; intimate)PHONO-SEMANTIC

Using your hand to welcome a secondary wife coming home illustrates the idea of receiving.

• 囗(encircling ring; surrounding loop)RADICAL
• 员(member)PHONETIC

A circle is a shape that is completely enclosed and closed like a member held within embracing arms.