于是他拿出火绒箱,并敲击打火石.Then he took out his tinderbox and struck the flint.只要它的质地接近打火石, 卡森就有足够的信心将它磨成一把耐用的小刀.If it chipped like flint, he could make a serviceable knife out of it.他觉得他扯了那么一通打火石的事, 现在有点害怕.But thinking he had said...
他们的课程包括基础卫生学和医疗知识.Their course of study includes elementary hygiene and medical theory.方法采用文献研究、现场环境卫生学调查与可行性研究相结合的方法.Methods review and field survey were applied for the study.本文对服装设计在服装卫生学方面有一定的参考价值.This paper is very ...