1.
By determining the ventilation resistance of the mine shaft ventilation system, it is found that the ventilation resistance in return airways is particularly large and the ventilation degree is middle.
通过对矿井通风系统进行通风阻力测定,发现矿井回风段通风阻力过大且通风难易程度为中等。
2.
One half of the world do not know the other half lives.
各地各风，难以沟通。
3.
My examination was a cinch and I passed easily.
考试不难,我轻而易举地通过了。
4.
It's a hard course:very few students romp through.
那门课程很难，很少学生能轻易通过。
5.
They ploughed through the sands in spite of the storm.
他们顶着风暴艰难地通过了沙地。
6.
Great books are popular, not pedantic.
名著绝不引经据典，艰深难懂，而是通俗易读。
7.
It is hard enough to master a langauge, let alone two.
要掌握一种语文不易，要精通两种语文就更难；
8.
A Comparative Study on the Level of Items in Putonghua Proficiency Test For Normal University Students;
师范生普通话水平测试项难易程度比较研究
9.
A Study on Reorganizing the Modern Popular Literature into Literary History;
分论易 整合难——现代通俗文学的整合入史研究
10.
It Is Easy to Understand Mandarin Language and Beijing Dialect but Difficult to Master Literatures and Classical Allusions--Discussion and Consideration on the Emendation of the Dream of Red Mansions
通官话京腔易,谙文献典故难——《红楼梦》校勘商兑
11.
Optimized Forecast Simulation Study on Mine Ventilation System in Haizi Coal Mine
海孜煤矿困难时期通风系统优化预测模拟研究
12.
problems of housing, traffic and communication
住房难,行路难,通讯难
13.
a friend is easier lost than found.
失友容易，交友难。
14.
Horses are easy to tame but tigers are hard to tame.
驯马容易，驯虎难。
15.
The leopard can never change its spot.
江山易改，秉性难易。
16.
And the statement says another common symptom is difficulty eating or feeling full quickly.
该机构还指出另一些普通症状是吞咽困难或易饱现象。
17.
One mechanism used to make investigation difficult is to arrange for a consignment to pass through a bewildering number of owners in a short time.
为了使调查难以进行，走私者通常会在短期之内使货物多次易主，
18.
a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal.
一种有毒无色易燃的液体有机碱，气味难闻，通常由煤衍生而来。