我5年前开始学习中文，但是断断续续的，所以语言能力达不到5年的水平

专业词汇，不确认下面的回答能否帮到你 趋动力： I am not sure is it a mistake for "驱动力"， 驱动力 is the driving force of something, 行情驱动力 could be thought of "driving force driven by market". if 趋动力 is the correct word. Maybe it means the power of market trend 单引擎： 相对双引擎，多引擎, one single engine. then, 成本单引擎 could be thought of "production cost is the only power of something" For example, if somebody is the only working person of a family, we can say this family is a “单引擎家庭”

这个是专业词汇，是经济学的吗？ 尝试一下找到对应的英文文献对照一下，单纯的字面翻译可能帮不到您

公司有急事，让他马上回国。 急事：emergency 马上：immediately 他让我告诉你，多跟他联系。 多(跟)： frequently you can also say: 多和他联系 which means: keep in touch with him frequently 以后出门一定要关好窗户。我还有事找他呢。 要： should 关： close / shut 好： properly in this sentence, 关好 equals 关，which means close. you can say "关好门" close the door, 关好窗 shut the window. Use the world 好 after 关 just to say you should double whether the window closed

You can choose Online payment; buying scratch card or go to carriers' business hall 1. Online payment you need to visit website of 中国移动/中国电信/中国联通 网上营业厅， you can google it. then find online payment(在线缴费)， follow the website's instruction 2. you can get scratch card in 24 hours store scratch card == 手机充值卡 3. go to nearest carrier business hall, ask the workers for help. payment terminal (充值终端), we call it 刷卡机 by the way, you can call customer service center 中国移动 10086 中国联通 10010 中国电信 10000 if you still got trouble, you can tell me which city and which carrier you choose, I can show you detail information

Yes, sometimes, they're interchangeable. 作 works for most of cases. It occurs much earlier than 做 in Chinese language history. But now, people prefer to use "做 + concrete noun" while “作 + abstract noun”, here are some examples: 做饭 cook 做蛋糕 make cake 做家具 make furniture 做衣服 make cloth 做作业 do homework 作弊 cheating 作曲 composing 作文 writing 作报告 reporting Generally, 做 is the word extended from 作. it's a little bit hard to distinguish them. It's rather custom than rule playing the role in choosing the correct word. So, use what you see is the best way for this case