阵痛期

• 阝(earthen mound; rampart)RADICAL
• 车(vehicle; cart; wheel)PHONETIC

A battlefield is where military vehicles gather behind fortifications to charge into battle.

• 疒(illness; disease)RADICAL
• 甬(tube; conduct straight)PHONO-SEMANTIC

A sharp pain like a tube piercing straight through the body causes illness everywhere.

• 其(that; that one)PHONETIC
• 月(moon; month)RADICAL

Watch the moon's phases wax and wane to count periods of time.