like: vermehren → →
vermehren ☊ 
sinh sôi ☊ 
☊ vermehren ☊ 增多 ☊ zēngduō The fish return to the river as adults in order to breed. ☊ adult ☊
The children are already learning to multiply and divide. ☊ multiply ☊
Most reptiles reproduce by laying eggs on land. ☊ reproduce ☊
reproduce itself: cells reproducing themselves (= making new ones) ☊ reproduce ☊