It is usually indefinite where the mountain ends and the plain begins. Is the mountain then a vague object, or are all objects themselves precise, with vagueness an artefact of the way we pick them out?
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。