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。...
Objective : To illustrate the killing effects avermectin on Leptotrombidium deliense on tropical coral islands.目的: 观察生物杀螨剂阿维菌素在热带珊瑚岛上对地里纤恙螨成虫杀灭效果.He lay on a coral beach where the cocoanuts grew down to the mellow - soun...