四维 
四维[-維] ²sìwéi {F} n. ①the four social bonds: propriety, morality, modesty, sense of shame ②the four directions ③〈Ch. med.〉 the four limbs ◆attr. 〈phy.〉 four-dimensional
四 四 four / - / pent in human legs four 維 维 fiber / - / thread turkey fiber