1) factors of drilling difficulty
![点击朗读](/dictall/images/read.gif)
钻探难度因素
4) problems and difficuties
![点击朗读](/dictall/images/read.gif)
疑难因素
5) difficult factor
![点击朗读](/dictall/images/read.gif)
困难因素
1.
On difficult factors and essential techniques in English listening course for English majors in the first and second years;
英语专业基础阶段听力课教学中的困难因素与对策
6) factors of difficulties
![点击朗读](/dictall/images/read.gif)
难点因素
补充资料:非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条