1.Do not use ladder near doorway.
不要在门口处使用梯子。
2.A Study on How to Use "Ladder Teaching Method" in P. E.
在体育教学中如何运用“阶梯式教学法”
3.The observation group to antibiotic treatment, use ladder down imipenem-west company he d sodium;
观察组予以抗生素降阶梯治疗,使用亚胺培南-西司他丁钠;