certain 用某个的意思造句,sure 和certain 的辨析

网友回答

1. For example, a radiologist at a big research hospital may provide a consultation for a rural hospital that doesn’t have the expertise to diagnose certain conditions.
　　比如，在大型研究性医院中的放射科医生就可以为没有设备或者条件的偏远地区的医院提供远程咨询。
　　2. Similarly, there are other products, especially those used in a transient manner, or those used by people with certain disabilities, that must be optimized for beginners.
　　类似地，还有其他一些产品，特别是某些偶尔或临时才会使用，或者为身体行动不便的人使用的产品，必须为新手进行优化。
　　3. Understanding why a user performs certain tasks gives designers great power to improve or even eliminate those tasks yet still acplish the same goals.
　　理解用户执行任务的原因让设计师能够改善，或者甚至是消除某些任务，同时仍然能够完成目标。

网友回答

二者的不同点:
　　1.在"It is certain that…/ to do something"结构中,It是形式主语,此时一般不用sure.如:
　　It is certain to take him a lot of time.肯定会占用他很多时间.
　　It is certain that two plus two makes four.二加二得四是确定无疑的.
　　2."Be sure +to do something"结构,用于祈使句,这时一般不用certain.如:
　　Be sure not to forget it.千万别忘了.
　　3.作定语时,sure表示"可靠的,无疑的".而certain修饰可数名词时,意为"某一,某些",修饰抽象名词时,意为"有点,有些".如:
　　The student made a sure answer.学生做出了确凿的回答.
　　A certain Brown is waiting for you at the gate.门口有个叫布朗的在等着你.
　　Certain students have failed in the test.有些学生测验没及格.
　　There was certain coldness in her attitude towards me.她对我的态度有点冷淡.
　　4.在口语中,sure可作副词,用在肯定答语中,相当于surely,certainly, of course,而 certain不能用作副词,如:Are you going Sure/Certainly.你去吗 当然啦