Translating from your Chinese.  See the differences in the versions.

我们公司一周开三次会议，Our company has thrice a week meetings. 一般在30分钟内开完除了一些特殊情况需要再强调讨论的地方，Usually they last for half hour unless special circumstances dictate that detailed discussions are called for. 开会时间在9：15分左右，The starting time is around 9:15am and 每个员工应该在9：15前到达，everyone should be there before then.  经理总是都准备好了等待着我们开始开会，The manager is always there first, waiting for us, fully prepared.  每次他都会给我们说一下一些正在做大货的订单的生产情况，Each time, he would brief us on the larger goods orders that are being processed 和出现的一些问题需要去注意的，and take note of the problems arosed. 我们的老板也有出席旁听，Our boss is also there as an observer. 他说开会不是走个形式，He said that meetings are not just a formality 而是为了提高每个员工的工作效率明确每天职责所在，but to improve their efficiency as their daily duties change according to circumstances [直接翻译令读者认為老板是个 "奴隶主"] 对产品的熟悉程度，and to know their product lines well.  希望我们每个人有问题要说出来一起来解决。 Hopefully that we can speak our mind to solve any potential problem that may arise. 我每次都能从会议上获得一些新消息，Each time, I gained new insights from these meetings. [新消息??? New information???  Is this slang? I don't know but from the context, I know it is not just news or new information.] 要更好的做好自己的工作就应该多去想如何才能做的更好更有效率，应该三思而行。To do a better job, I need to think of new ways to improve and be more efficient, for this, I have to think twice before any action.  [The nuance from your English is totally different from the one in Chinese.  Here, you have a reason and so it is OK as it no longer sounds like a slogan or mantra]

Learning Much from A Meeting teaching me a lot

Correcting from your English without looking at your Chinese...

A Company meetings are held [不许用过去式因為是 "事实", 現在还如此. 用过去式即現在沒有了或者沒有一週三次的开会] was hold in our company three times a week. It usually finished within lasts about 30 minutes [half an hour] except for anything special ones. need to strick on,our Meetings begined ["begin" 的过去式是 "began"] around 9:15am,_ but everyone should be attend there before then. 9:15am, My manager is always was ready for to showed us the daily process of the orders with PPT, using PowerPoint  [如果我不是專业電腦, 我就不知道这个是什么, 不要令读者有一頭霧水] and points out sometings need to pay where more attention is needed.  our boss also was in his seat ,he Our boss tells told to us of the purpose of the meeting and to make  which made sure that everyone chould get be acquianted with the items.  ,Not for just a in meetings,_we and should be speak freely whenever there are  out in the meeting if had any doubts and to find to get a solution way to solve out.

I learn much/a lot/ from each meeting.__One you should take the things seriously into consideration if you hope to get better out from of your job.  Think twice before do it. [英文不会这样写, 前句已明顯了, 如果真要的话, 用 "Always look before leaping"]

我们公司一周开三次会议，一般在30分钟内开完除了一些特殊情况需要再强调讨论的地方，开会时间在9：15分左右，每个员工应该在9：15前到达，经理总是都准备好了等待着我们开始开会，每次他都会给我们说一下一些正在做大货的订单的生产情况，和出现的一些问题需要去注意的，我们的老板也有出席旁听，他说开会不是走个形式，而是为了提高每个员工的工作效率明确每天职责所在，对产品的熟悉程度，希望我们每个人有问题要说出来一起来解决。 我每次都能从会议上获得一些新消息，要更好的做好自己的工作就应该多去想如何才能做的更好更有效率，应该三思而行。