音标
英语音标：[ˈnesəs(ə)rɪ]
美语音标：[ˈnɛsəsɛri]

翻译
adj.
必需的;必要的;必然的;无法避免的

n.
必需品

例句

It was concluded that the level of change necessary would be low. 

结论是，需要作出的变更程度很低。

We are still looking for someone who combines all the necessary qualities. 

我们仍在寻觅兼备所有必要才能的人选。

I couldn't enter the country because I didn't have all the necessary documentation. 

我不能入境是因为我证明文件不齐备。