Calcium carbonate occurs in the allomorphs calcite and aragonite.同质异晶的方解石和文石中含有碳酸钙.The chemical composition of the melo shell is calcite and aragonite.美乐贝的化学成分是方解石和文石.Aragonite and magnesium calcite are more soluble than...
鲍勃从椅子上滑下来，趴在了地板上。Bob slid from his chair and lay prone on the floor.接着他被一把推倒，脸朝下趴在了人行道上。He was then shoved face down on the pavement.她趴在浴室的地上。She was on her hands and knees in the bathroom....
他们属于迷惘的一代，想要找寻自我。They are a lost generation in search of an identity.我觉得十分迷惘，难过极了。I feel really confused and wretched.人类的智慧在自己的创造物面前感到迷惘而不知所措了.The human mind stands bewildered in the presence of its own creation....