你可以向孩子们解释，植物不仅是制作食品所必要的，而且对于控制洪水也是不可少的。
You can explain to them that plants are necessary not only for food but also for controlling floods.
因此，在摄影测量的作业过程中，有必要对近景摄影机进行检校，对数码相机的标定是一项必不可少的作业过程。
So, in the course of photogrammetry job, it is necessary to calibrate the close shot metric camera, and it is an essential job course to demarcate the digital camera.
此外，食物要以巧克力和糖为主，提供充足高能量的食物也是很有必要的，当然，纯净水也不可少。
In addition, the food should be mainly to chocolate and sugar, to provide adequate and high energy food is also very necessary, of course, the pure water can not be less.
可见，沟通不仅仅是软件项目管理的必要手段，更重要的，沟通是软件生产的手段和生产过程中必不可少的工序。
Therefore, communication is not only the essential way of software project management but also a must for production method and working procedure.
创建和必要的“空间规划，提出”是必不可少的，在这种设计前线娱乐区从车道地区招手。
Creating and planning for the necessary "room to move" is essential; in this design the front entertaining area beckons from the driveway area.
因此，进行CO2地质埋存的风险评估是相当有必要的，是我们能长期有效安全地进行该项减排方案必不可少的基础和保证。
Thus, it is necessary to the leakage risk assessment of CO2 geologic storage, which is the indispensable basis and guarantee to safely and effectively geological storage CO2 for a long term.
教学环境是英语教学活动中必不可少的必要条件，也会影响整个的英语教学的效果。
The teaching environment is essential for English teaching, which will also affect the results of English language teaching.
超市在本人们生活中势必不可少的，本人们在超市里购物，取得必要的生活必需品。
Supermarket potential in our lives are essential, we are in the supermarket shopping, access to essential necessities of life.
超市在本人们生活中势必不可少的，本人们在超市里购物，取得必要的生活必需品。
Supermarket potential in our lives are essential, we are in the supermarket shopping, access to essential necessities of life.
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