Based on the currently available test devices and measuring methods, it is quit difficult to accurately measure the vaporization rate of mineral matter in coal combustion process.
鉴于目前国内的实验设备和测量手段，精确测量煤燃烧过程中各种矿物质的气化率还存在很大困难。
It may seem difficult to quit an addition, but don't you think it might be worth it?
也许看起来做到这些是很困难的，但是你不认为这是很值得的吗？
When facing a difficult challenge it's easy to quit. Don't quit until you achieve your goal.
当面对艰难挑战时很容易退却。不达到目标不要退却。
Each time I failed in my quit attempt, I felt guilty and weak and unsure of my ability to overcome such difficult hurdles.
在我每次试图戒烟失败后，我都感到既虚弱又无比自责，同时对自己克服这种困难的能力持怀疑态度。
Nicotine is highly addictive, and to quit smoking - especially without help - can be difficult.
尼古丁很容易上瘾，而戒烟——特别是在没有帮助的情况下戒烟——是很困难的。
Something inside us forces us to choose this way of life — despite the difficult situations we face that may ultimately make us quit.
我们在内心存在的某种东西驱使我们选择这种生活方式—虽然我们面对的困境最终可能会让我们放弃。
He is abject. He is not honest. You can talk with him about this matter. But you cannot quit. At present it is difficult to find a job.
他很可耻。他不诚实。你可以和他说这事。但是你不能离开公司。现在找工作很难的。
I've been trying to quit smoking for awhile now, but going cold Turkey is very difficult.
我试图在一段时间里戒烟，但是突然戒掉是很困难的。
Susan : Why don't you quit as well?Gary : It's really difficult. Susan : Come on;
苏珊：你何不也戒掉呢?加里：那真地很困难。
Doctor: That is quite a long period, it is rather difficult for you to quit smoking all at once. Let's make a plan, for instance, smoke 5 cigarettes less each day. Do you think you can do it?
医生：吸烟已有这么长时间，想一下戒掉是不容易的。让我们定一个计划，例如请你每天少吸五支。你看这样好吗？
Doctor: That is quite a long period, it is rather difficult for you to quit smoking all at once. Let's make a plan, for instance, smoke 5 cigarettes less each day. Do you think you can do it?
医生：吸烟已有这么长时间，想一下戒掉是不容易的。让我们定一个计划，例如请你每天少吸五支。你看这样好吗？
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