Ancient people made clay pottery because they needed it for their survival.古代人制作陶器是因为他们的生存需要它.The original clay pottery is a pottery, producing a simple surface, no decoration.原始陶器是泥质陶器, 制作简单,表面无装饰....
Although the coral looks hard, it is very delicate.珊瑚虽然看上去坚固，实际上非常易碎。A coral reef is built by the accretion of tiny, identical organisms.珊瑚礁是由许多相同的微生物不断堆积而成。Coral can be yellow, blue, or green.珊瑚有黄色的、蓝色的或绿色的。...