adj.确定的,某一个,无疑的,必然的,可靠的 pron.某几个,某些例句:I´m certain (that) she saw me. 我肯定她
2011-11-27
v.知道,了解,认识,熟悉,认出,分辨,确信例句:I know Jane.She is my co-worker.She is a very charming girl.  
2011-11-27
n.需要,必需,必需品,要求,贫困 vt.需要 modal v.必要,必须例句:Tom: What do we need? 汤姆: 我们要些什么呢?
2011-11-27