必需的

By reengineering, the number of steps was slashed to 20 and the time required to fill an order was cut from three weeks to one week.

被再生工程，数字步骤是削减至 20 和时间必需的填充一次序是削减从三个星期至一个星期。

One camera bag is also necessary, so that when the roll of film can be carried out in the next room.

一个相机包，也是必需的，因此，当胶卷可以进行在隔壁房间内。

An external filter capacitor is required for normal operation.

外部滤波电容是必需的正常运作。

Coolant Through Spindle with micro filter system, spindle pump and all the necessary plumbing.

通过主轴中心冷却系统包括微过滤系统，增压泵及所有必需的连接管材。

Fluorine is one of crucial chemical elements to human health and can be tested in almost every parts of a healthy human body. Overloading of fluorine may cause dental and/or skeletal fluorosis, while in fluorine deficiency areas, fluoride drinking water supply or other methods of fluoridation may greatly reduce the ratio of dental caries of local residents. Researches on relation between fluorine concentration in drinking water and the ratio of human dental caries as well as the evaluation on efficacy of drinking water fluoridation have been lasted for 6 decades.

中文题名中国部分城市和地区居民饮用水氟含量与口腔健康相关性研究副题名外文题名 A research on relation between fluorine concentration in drinking water and residents' dental health of some cities and areas in China 论文作者王滨滨导师郑宝山学科专业地球化学研究领域\研究方向学位级别博士学位授予单位中国科学院地球化学研究所学位授予日期2003 论文页码总数103页关键词饮用水口腔健康氟中毒龋病饮用水馆藏号BSLW /2003 /R123 /3 氟是人体必需的微量元素之一，正常人体各组织和器官都含有氟。

Fluorine is one of the necessary trace elements for the body and it has many physiological effects.

氟是机体生命活动所必需的微量元素之一，具有多方面的生理作用。

It contains all the necessary functions for drawing various geometric and freehand shapes and organizing them on the page.

它包含在页面上绘制各种几何形状、任意形状和管理它们必需的所有功能。

If force is integral to international politics, it must be fungible.

如果武力是国际政治所必需的，那么它必须有可互换性。

Phosphate. It is essential glutamic acid fermentation process, but the concentration can not be too high, otherwise they will be to valine fermentation.

磷酸盐。它是谷氨酸发酵过程中必需的，但浓度不能过高，否则会转向缬氨酸发酵。

Due to their inexperience and gullibility, they may go astray after watching too many these programs.

由此可见，教师是必需的，因为他们可以给学生指导和教育。

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。。。。