It is necessary to exercise caution when making commendations.

做推荐时有必要谨慎一些。

It is necessary to set down these additional rules.

有必要制定这些补充规则。

Perseverance combined with energy is necessary to success in life.

毅力加上精力是人生成功的要素。

It is necessary to decrease the amount of coal used.

必须减缩用煤量。

It was necessary to discover the truth or otherwise of these statements.

有必要查证这些说法是否真实。

It is necessary to get the youth to have a high ethical concept.

必须使青年具有高度的道德观念。

To be a namely piper it is necessary to study for 7 years.

要做个著名的笛手, 需要学习七年。

Food is necessary to maintain life.

食物是维持生命所必需的。

In designing a machine it is necessary to reduce friction as much as possible.

在设计一种机器时, 必须尽可能减低摩擦。

In this case it is necessary to cancel the party planned for June 16th.

既然如此, 那就必须取消原定于6月16日举行的聚会。

In order to prevent infection, it is necessary to properly deterge and disinfect the wound.

为预防感染，有必要适当地对伤口进行清洁和消毒。

Sleep is necessary to health.

睡眠对健康是必要的。

It may be necessary to redrill the sparger holes if a boil out does not correct the problem.

如果不能解决问题可能需调整喷淋。

Developing investment-style nonlife insurance products is necessary to meet various financial needs and to strengthen nonlife insurance companies.

摘要非寿险投资型产品是带有投资性质的非寿险保险产品。

It is necessary to oppose and reject all kinds of cacodoxy against Marxism for the purpose of keeping the status of Marxism.

坚持马克思主义的指导地位，必须坚决反对和抵制各种反马克思主义的错误思潮。

Higher education management should be viewed as a process or a system.It is necessary to be well aware of the pacificator and master.

应把高等教育管理作为一个过程、一个系统来看待，必须对其调节者和控制者有充分的认识。

The paper expounds in detail the relation between oil density and metering and suggests that it is necessary to propagand metrical knowledge to customers.

详细阐述了油品储存收发过程中密度与计量的关系,并提出了向客户宣传计量知识的必要性。

Franz Brentano and Wilhelm Windelband separately hold psychologism and anti-psychologism in their value thoughts, which shows that some psychology foundation is necessary to axiology.

布伦塔诺和文德尔班在哲学价值论的开端上形成了心理主义与反心理主义的对比，表明对价值的哲学探究与心理学有着内在的联系，价值哲学需要一定的心理学基础。

For turning from such unbenefited situation, it is necessary to reexamine the governance structure of our current solely state-owned company and make a further exploration.

为扭转这种不利局面，有必要重新审视和深入研究我国现行国有独资公司的治理结构。

Considering the scarcity of the amphibian and reptant medical animals in Shanghai,it is necessary to carry out proper protection and better control and utilize them more rationally.

上海市不少两爬类药用动物资源已十分稀少,应加强保护、规范管理,更合理地利用两爬类药用动物资源。