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在必要的时候
1、necessary evil───n.无可避免之灾祸；n.不可避免的灾祸
2、not necessary───不需要；不必要
3、if necessary───如果必要的话；如必要的话
4、in necessary───必要时
5、no necessary───没有必要
6、absolutely necessary───绝对必要；不可或缺；不可缺少；必不可少
7、necessary skills───必备技能
8、necessary───n.必需品；adj.必要的；必需的；必然的；n.(Necessary)（英）内塞瑟里（人名）
9、necessary elements───必要要素
1、Although an architect is not expected to be an expert in everything, they must be able to "go deep" when necessary.───尽管我们希望架构师是万能的，但是他们必须在需要的时候“深入进去”。
2、Listen patiently and, when necessary, offer suggestions of what you could do to help.───耐心倾听，在必要的时候给予适当的建议，看看自己能为对方做些什么。
3、The government, when necessary, has recourse to the armed forces.───政府在必要时可以动用军队。
4、They are not afraid to tackle the issues or let the sparks fly when necessary.───他们不怕应付这些问题, 必要时也不惜进行唇枪舌剑的激烈争论。
5、From the side of the mirror to see a mirror, procuratorial clean effect is satisfied, when necessary key wipe again.───从镜子的侧面来观察镜子，检察清洁效果是否满意，必要时重点擦抹一遍。
6、Understanding your different roles and learning to keep them distinct when necessary can help you keep some sense of balance between them.───理解每个不同的角色，学着把他们各自区分开来有助于你保持各个角色的平衡。
7、Though the focus of these efforts was detection, the command center would turn into a war room optimized for defense when necessary.───尽管工作重心是侦察，但需要时，指挥中心也会变成以防御为中心的作战室。
8、With any container that you choose, you need to ensure that it allows the water in it to drain when necessary.───对于您选择的任何容器，您需要确保在需要的时候它能够排除里面的水。
9、To make it easier for you to re- create the database schema when necessary , create command files to define the tables in your database .───为了在必要时更加方便地重新创建数据库模式，请创建命令文件以定义数据库中的表。
1、When necessary, instinct is the most reliable resource you can fall back on.
2、The government, when necessary has recourse to the armed forces.
3、However, when necessary, treatment with any of the benzimidazoles, levamisole or ivermectin will remove adult worms and developing stages.
4、Proponents argue that when necessary, Congress would waive the provision of this amendment with a three-fifths vote.
5、When necessary, bacteria cheat to ensure a supply of new mutations.
6、Hal could do this when necessary, but most of his communication with his shipmates was by means of the spoken word.
7、They must make physical, musical and, when necessary, dramatic sense.
8、Praise them when necessary, but don't lay it on too thick.
9、Deal with any problems when necessary, so preventing a build-up of strain.