know the business;know the ropes;know one's job ;

I'm just a layman , which means that instead of helping you out, I may create trouble.
我又不懂行, 帮不了忙反而添乱.
来源:网络文摘精选Investment is a hazardous business; even those who are in the swim sometimes come a cropper.
投资是一项风险事业, 就是那些懂行的人有时也会栽跟头.
来源:词典精选例句If investors were perfect judges , the two would require exactly the same skills.
如果投资家很懂行,那么创业和说服投资家就是一回事.
来源:互联网摘选The moment she got to know the ropes, there was no stopping her.
一旦她懂行了,就什么也难不住她了。
来源:《柯林斯高阶英汉双解学习词典》Is it discharging its duty to diversity by printing snippets of opinion from unqualified readers?
难道通过刊登不懂行的读者的片断见解就算尽到了应有多样性见解的职责了 吗 ?
来源:词典精选例句The service at the store is excellent. They really know what they are doing.
这家店的服务很好. 他们真的很懂行.
来源:互联网摘选缺点: (戏的)作规则有时候在许多回溯进程上会执行的不彻底(翻译, 需要懂行的、过的朋友指正)角色的等级不平衡.
来源:互联网摘选Of course, there are very few is a customer does not know your business backseat.
当然, 也有极少数是客户不懂行而又瞎指挥造成的.
来源:互联网摘选
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