必须的

We think the spread of emotion has a fundamental psychobiological aspect," said Christakis."Physical personal interaction is necessary, so the effect decays with distance.

我们认为情绪的扩散有一个基本的心理生物学层面，&Christakis说，&人与人之间的现实互动是必须的，所以效应随着距离递减。

Under the field-grown condition,two straw residue and three nitrogen application rates were designed to investigate the remobilization of assimilation and nutrient absorption.

0引言氮素是作物生长必须的营养元素之一，在生产中具有十分重要的地位，土壤中氮素的丰缺及供给直接影响农作物的生长和产量。

When this happens you should remove the rufter hood from her head and replace it with an ordinary hood, make sure the regular hood fits the bird comfortably.

当这一切发生的时候，你就可以换下非正式的帽子，而用一个真正的鹰帽来替代，当然你必须的确保这个新帽子戴起来足够舒服。

Also highlighted are the warnings about most likely failure points that will fail your installation of Windows XP with Boot Camp, such as the need of unpartitioned hard disk and the must of selecting the C: drive to install Windows XP when prompted in installation.

还强调是警告，最有可能的故障点，将失败的Windows XP安装与新兵训练营，如需要，未分区的硬盘和必须的选择C ：驱动器安装Windows XP时，提示在安装。

There is a similar need today for co-ordination, this time in fiscal policies.

在今天的形势下，协调同样也是必须的，这次需要的是财政政策的协调。

A certain amount of public works — of streets and roads and bridges and tunnels, of armories and navy yards, of buildings to house legislatures, police and fire departments—is necessary to supply essential public services.

一定数目的政府公共建设工程---诸如街道、公路、桥梁、隧道、兵工厂和海军船坞，以及容纳立法机关，警察，消防部门办公的建筑等----对于政府提供基本的公共服务也是必须的。

Certainly, improvements in equipment and facilities, upgrading of roadbeds, and better monitoring and control of rail fleets are necessary.

当然，设备设施的完善，路面状况的改善，和对火车车辆的监控加强是必须的。

Under the environment that economy globalizes day by day, the construction of the economic legal system of our country is receiving new challenge constantly, but this brings the developmental and perfect opportunity.

在整个法的体系中，经济法律体系是一个既各自独立，又相互联系的若干个法的部门。社会主义市场经济法律体系是完善社会主义市场经济体制所必须的。

Wisdom invokes questions of judgement , ethics, experience and intuition, all of which are necessary for the best application of knowledge.

明智行为调用对判断、伦理、经验和直觉的质疑，所有这些对知识的最好的应用都是必须的。

Although most people believe that formal education is required for scientific success, a college diploma is not always necessary.

尽管大多数人都始终认为成功的学术是要接受过正规教育的，但是大学的文凭却通常并不是必须的。

This paper discusses design and realizable methods of remote test output interface from logical design angle.

本文从逻辑设计的角度讨论遥测输出接口的设计及实现方法。

This also 星体投射plies to buildings, structures and geological features.

这也适用于建筑物和地质特征。