it is necessary to的例句：
It is necessary to keep the offices neat .
有必要保持辦公室的整潔.
I it is necessary to learn a foreign language .
我認為學(xué)習(xí)一門外語是必要的.
In this situation it is necessary to rank the projects .
在這種情況下,有必要對有關(guān)項目分等排列.
It is necessary to maintain surveillance on these meters .
必須對這些儀表保持經(jīng)常性的監(jiān)測.
For proper combustion it is necessary to atomize the propellants .
為了有效地進行燃燒,推進劑必須霧化.
It is necessary to accept a substantial degree of state intervention .
接受極大程度的國家干預(yù)是完全必要的.
I find it sad that couples it is necessary to sign such documents.
我認為這對夫婦覺得有必要簽署這樣一份約定的想法是可悲的.
It is necessary to weigh the answers in accordance with the general veracity of the owner .
需要根據(jù)所有者的一般誠實程度來衡量其回答.