the effects of unilateral hyper-erupted third molar tooth on apical stress distribution of mandibular teeth by photoelastic analysis

a little mind, having no space, can practise meditation, practise silence;

一个小头脑，没有空间，能够练习冥想，修行寂静；

practise meditation regularly to bring your inner peace to the fore.

经常练习冥思可以让内心平静重要起来。

the study of the direction of main vertical vector at space curve

空间曲线的主法向量方向的探讨

k instead of using the vertical vector k, you use the normal vector i.

你用了法向量i，而不是竖直向量。

but most of all harry potter's delight, he met two friends -- honest and good boy ron and be clever and sensible girl hermione.

不过最让哈利波特高兴的是，他结识了两个朋友——忠厚善良的男孩罗恩和聪明伶俐的女孩赫敏。

and we can't give up learning english even though we have trouble in learning english

还有，我们不能放弃学习英语，即使我们遇到了难题。

i have trouble in finishing the work

完成工作对我来说有困难

because i have trouble in english grammar, i attend a full-time english class of stvu to study grammar.

因为我英语语法有困难，所以我参加了电视大学全日制班来学习语法。

sb have trouble (in) doing sth

某人（做）某事有困难

have trouble in doing something

在完成某件事情时有麻烦

i have trouble in finishing the homework on my own

我一个人做这家庭作业有点麻烦

have trouble in doing sth look up new words in a dictionary

在字典里查新词

since i also have trouble in english grammar, i attend an english class to study grammar.

由于我在英语语法上也存在困难，我参加了一个英语学习班学习语法。

for example, he will help me by himself if i have trouble in my study.

比如我学习方面有困难时他就会亲自辅导我

do you have trouble in learning english ?

你在英语上有困难吗？。

if you have trouble in work, you should keep the tail from wagging the dog.

如果你在工作上遇到了困难，一定要顾全大局，千万不要因小失大。

i do have trouble in spelling.

我在拼写方面有问题。

i have trouble (in) getting the car to start.

我要发动这辆汽车有困难。

i have trouble in doing my homework.

我做作业有困难。

i have trouble in falling asleep at night.

我晚上入睡有困难。