基本解释[地球科学]详细说明书英汉例句双语例句The author should be someone who knows your work well enough to write a circumstantial letter.写推荐信的人应该对你的学习有充分的了解，才能写出一份详尽的推荐信。edu.sina.com.cn专业释义地球科学详细说明书