It is necessary to lock the door when you leave.當你離開時，鎖好門是很有必要的。

1，They can authorize the necessary aid to a branch.

董事會可以授權給予某一個分公司以必要的幫助。

2，Voluntary Jordanian organizations will also continue to deliver the

necessary aid to our brothers in the Palestinian territories.

約旦志願組織也將繼續為巴勒斯坦領土的兄弟姐妹提供必要的援助。

3，The study therefore recommended that those countries be provided with the

necessary aid to establish remote sensing systems.

因此，該項研究建議，應向這些國家提供必要的援助，以建立遙感系統。

4，Moreover, States should facilitate access to food in countries other than

their own and provide the necessary aid when required.

另外，各國應為在其他國家獲得食物提供便利，並應要求提供必要的援助。

5，The obligation to provide the necessary aid when required is particularly

important in the context of disaster relief and humanitarian assistance.

在必要時提供所需的援助的義務對於救災和人道主義援助尤為重要。

1No previous experience is necessary for this job.

這一工作無需相關的經驗。

2A radical overhaul of the tax system is necessary.

有必要徹底改革稅制。

3Some adjustment of the lens may be necessary.

可能需要調整一下鏡頭。

4.I'll make the necessary arrangements.

我會做一些必要的安排。