对...必需

Is necessary and important to our country's de?

对我国的发展建设是必需且重要的。

It is necessary to know well the decay law of X2ray in explosive for radiographic inspection of weapon.

为了对武器进行X 射线无损检测，必需掌握X 射线在炸药中的衰减规律。

B OEING TECHNICAL DICTIONARY 40 DECIBEL, A unit of gain derived by computing the tio of input power to output power. ECISION ALTITUDE/HEIGHT, A specified ltitude or height in the precision approach at hich a missed approach must be initiated if the ECISION HEIGHT 1, With respect to the proach or execute a missed approach.

分贝 常表示两个声音信号或电力信号在功率或强度方面的对差别的单位，相当于两个水平的比率的常用对数的十断高度/高，在继续进近必需的目视参考没有建立的情况下开始复的精密进近中的一个指定高度或高。

Most diabolically, our bodies are addicted early to substances that we then crave for a lifetime, substances that nature endowed us with a liking for because in nature they're essential and, in small quantities, good for us.

更可恶的是，我们的身体更早沉迷于那些我们渴望一生的物质，那些自然赋予我们的，事实上是必需的而且少量的话会对我们有好处的深受人们喜爱的物质。

Using these diagrams, thermodynamic analysis is carried out to show the effect of technical conditions on soda decomposition of scheelite. It appears that the concentration of has direct effect on soda decomposition of scheelite. When the alkalinity is low, will hydrolyze to , accordingly the decomposition rate of scheelite becomes lower because of the decrease of . So in order to get higher leaching rate in industry practice, it is necessary to use enough amount of soda to serve as digestion reagent and, certain amount of NaOH to maintain high enough alkalinity.

利用这些热力学平衡图对Na2CO3分解白钨矿的工艺条件进行了分析，认为溶液中浓度直接影响白钨矿分解，而当碱度较低时，Na2CO3将水解生成，从而降低浓度，进而降低白钨矿的分解率；故在工业实践中，为使钨最大限度地转入溶液，除了保证足够的Na2CO3用量，还必需添加NaOH以维持一定碱度。

Contrast is necessary for the human eye to be able to discriminate between objects and their background.

差别对人类的眼睛是必需的可以在物体和他们的背景之间区别。

The drafter puts the designs on paper that are essential to managers,...

在起草文件，提出对所必需的设计管理人员，金融家，工程师和制造。。。

The article shows the importance of mathematics and has probed some reform for the mathematics teaching in high profession, and also elaborated the principle of "necessity and ede- quncy" for the teaching in education, which is to join up with the professional courses;paying at- tention to the ability of students for mathematical accomplishement and enduring study; empha- sizing the adaptability of fundament, interesting, ability and major with students; and also em- phasizing to merge the mathematical mod...

本文揭示了数学的重要性，对高职高专数学教学改革做了一些探讨，阐述了高职教育中，数学教学应以"必需、够用"为原则，与专业课紧密衔接；要注重培养学生的数学素养和可持续学习的能力；要注重学生的类比推理能力的培养；强调教学要与学生的基础相应，与学生的兴趣、能力、专业相适应；强调把数学建模的思想融入到教学中，以提高学生运用数学工具解决实际问题的能力。

The center aisle: Need more time to investigate immigration status and the person needs to stay on Ellis Island for a while. So, NY is the right one.

中间走道：需要更多的时间调查移民身份，那些人必需要住在Ellis Island一段时间，因此，纽约是对的。

Such excitatory neurotransmitters are necessary for normal alertness, memory, muscle tone and co-ordination, emotional responses, endocrine gland secretions, heart rate and blood pressure control and a host of other functions, all of which may be impaired by benzodiazepines.

这些兴奋神经传导质对正常的警觉，记忆，肌肉的紧张性和和谐性，情感反应，内分泌，心率和血压控制以及许多其他功能是必需的，所有这些都会被苯二氮卓类药物损坏。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。