#改變位置
#保護免受液體流失危害
#Modify position
#Protect from loss of liquids
仙人掌躲避陽光 (Cactus hides from the sun)
烏羽玉透過失水引起的收縮潛入沙漠地面，在降雨後吸水誘導膨脹而重新冒出，以適應季節性水分供應變化
(The shoot of the mescal cactus adapts to seasonal water availability via dehydration-induced shrinking below the desert floor, and hydration-induced swelling to reemerge after rainfall.)
