The preposition and the verb 通过
The preposition 通过
The preposition 通过 
emphasizes that a person uses a method to get a result.
emphasizes that a person uses a method to get a result.Examples
通过谈判解决问题
to settle matters by negotiation
tōngguò tánpàn jiějué wèntí
通过 can take two positions in a sentence:
1) at the beginning of a sentence. In this case, a comma is placed after 通过.
Scheme
通过
method
who
result
Examples
通过经常跟中国朋友聊天，他的汉语水平有了很大的提高
Thanks to frequent communication with his Chinese friends, his level of Chinese has improved significantly
tōngguò jīngcháng gēn zhōngguó péngyou liáotiān, tā de hànyǔ shuǐpíng yǒu le hěn dà de tígāo
通过这次考试，老师发现了我们学习中的一些问题
Thanks to this exam, the teacher discovered some problems in our education
tōngguò zhè cì kǎoshì, lǎoshī fāxiàn le wǒmen xuéxí zhōng de yìxiē wèntí
通过这几个月的锻炼，我的身体好多了
My health has improved greatly thanks to a few months of exercise
tōngguò zhè jǐ ge yuè de duànliàn, wǒ de shēntǐ hǎo duōle
2) after a subject in the middle of a sentence.
Scheme
who
通过
method
result
Examples
我们得通过代理公司雇用女佣
We have to hire a maid through the agency
wǒmen děi tōngguò dàilǐ gōngsī gùyòng nǚyōng
这种疾病通过蚊子传播
The disease spreads through mosquitoes
zhè zhǒng jíbìng tōngguò wénzi chuánbō
The verb 通过
The verb 通过 indicates movement, passing.
indicates movement, passing.Examples
火车马上就要通过长江大桥了
The train is going to cross the bridge across the Yangtze River
huǒchē mǎshàng jiù yào tōngguò chángjiāng dà qiáo le
前面正在修路，汽车不能通过
The road ahead is under construction and the car can’t get through
qiánmian zhèngzài xiū lù, qìchē bù néng tōngguò
The verb 通过 is also used to indicate that a person has succeeded in a task. For example, he has passed an exam or an interview.
Examples
我通过这次考试了
I have passed this exam
wǒ tōngguò zhè cì kǎoshì le
他昨天去那家公司面试了，可是没通过
Yesterday he went to that company for an interview, but he didn’t pass
tā zuótiān qù nà jiā gōngsī miànshì le, kěshì méi tōngguò