The isotopic signatures of most ancient limestones indicated the same process.大多数古代石灰岩的同位素特征说明了同样的过程.There are four principal types of limestones.石灰岩有四种主要类型.Soil: Altitude 260 meters, southeast orientation . Limestone gr...
拼写错误经常是由于匆忙而造成的。Spelling mistakes are often just the result of haste.姑娘们匆忙跑了出来，爬进汽车，然后开车走了。The girls hurried outside, climbed into the car, and drove off.鲍勃匆忙赶去和他会合，然后两人一起开车回家。Bob hurried to join him, and they rode home ...