certain

1.确实；确定；肯定that you can rely on to happen or to be true

2.确信；确定；无疑firmly believing sth; having no doubts

3.（不提及细节时用）某事，某人，某种used to mention a particular thing, person or group without giving any more details about it or them

4.（与人名连用，表示说话者不识其人）某某，某位，一位叫…的used with a person's name to show that the speaker does not know the person

5.轻微的；微小的；显而易见却难以描述的slight; noticeable, but difficult to describe

for certain

肯定；确定；无疑without doubt

make certain (that…)

弄确实；弄清楚；弄明白to find out whether sth is definitely true

make certain of sth/of doing sth

确保（做某事）to do sth in order to be sure that sth else will happen

of a certain age

不算年轻的；年纪不轻的；中年的if you talk about a person beingof a certain age , you mean that they are no longer young but not yet old

1.（不提及人或事物的名称时用）某些used for talking about some members of a group of people or things without giving their names

1.某,某一;某种,某些;相当的,一定程度的;(某种)不好意思说出来的

2.必然;有把握,确信 (of, that)

3.(数量,日期等)已确定的;(证据等)确凿的,无疑的;(知识,技术等)正确的,可靠的

1.某几个,某些

1.having no doubts that something is true

2.definitely going to happen; definitely true; definitely known

1.used for referring to someone or something without being specific about exactly what or who they are; used for referring to someone or something without saying their name, when you know that the person you are talking to knows who or what you are referring to