necessary

1. ADJ Something that is necessary is needed in order for something else to happen. 必要的

I kept the engine running because it might be necessary to leave fast. 我讓發(fā)動(dòng)機(jī)一直開著，因?yàn)榭赡苄枰焖匐x開。

Make the necessary arrangements. 做必要的一些安排。

2. ADJ A necessary consequence or connection must happen or exist, because of the nature of the things or events involved. 必然的[ADJ n]

Scientific work is differentiated from art by its necessary connection with the idea of progress. 科學(xué)工作不同于藝術(shù)在于它與進(jìn)步的概念有必然聯(lián)系。