积极分子

• 禾(grain; rice plant)RADICAL
• 只(only; sole)PHONETIC

Accumulation is gathering one grain of rice at a time until the granary is full.

• 木(tree; wood)RADICAL
• 及(reach; attain; catch up)PHONO-SEMANTIC

An extreme point is the uttermost end of a wooden pole, where a hand just barely reaches.

• 八(divide; separate; eight)ASSOCIATIVE
• 刀(knife; blade; sword)RADICAL

Using a knife to chop something in half represents division or separation.

• 子(child (pictographic))ASSOCIATIVE

The character 子 depicts a newborn child with a large head and arms outstretched.