必须

But the proportion of necessary aliphatic acid and unnecessary aliphatic acid should be proper.

油脂是人类赖以生存必不可缺的组成部分，其所含必须脂肪酸和非必须脂肪酸的比例应适当。

Chet must set up a new bank account for FIFA's money. And he must submit it to the scrutiny of a firm of Antiguan accountants.

为拿到这笔钱，切特必须开一个新的银行帐户，并且，这个帐户必须由一家安提瓜会计师事务所进行审查。

Just as one needs to know how to use a typewriter to compose ascript, one does need to know how to operate a camera to make photos,but that's only a tiny part of the process.

就像想要写作的人必须知道如何操作打字机一般，想要摄影的人也必须了解如何操作一台相机，但是这却只是创作过程中的极小的一个环节。

Antirejection therapy was necessary in 5.3% ATIP, 31.6% controls with 20% of both cohorts developing PTDM.

必须采用抗排斥疗法进行治疗的ATIP组和对照组患者所占的比例分别为5.3%和31.6%，在两组出现PTDM的患者中则有20%的患者必须采用抗排斥疗法。

Deviation or delay in prosecuting the voyage contemplated by the policy is excusedWhere arthorised by any special term in the policy ;or Where caused by circumstances beyond the control of the master and his employer;or Where reasonably necessary in order to comply with an express or implied warranty;or Where reasonably necessary for the safety of the ship or subject-matter insured; or For the purpose of saving human life, or aiding a ship in distress where human life may be in danger; or Where reasonably necessary for the purpose of obtaining medical or surgical aid for any person on board the ship;or Where caused by the barratrous conduct of the master or crew, if barratry be one of the perils insured against.

（1）船舶在进行保险单预期的航次中，下述绕航或延迟可允许：保险单中任何特别条款授权许可者，或船长和其雇员不能控制的情况造成的；或为遵循明示或默示保证所合理必须的；或为船舶和保险标的的安全所合理必要的；或为了救助人命或为援助有人命危险的遇难船舶；或为船上任何人员及时得到内、外科治疗所合理必要的；或如果&船长、船员恶意损害被保险人利益的行为&系承保风险，由于该恶意行为造成的。（2）一旦允许绕航或迟延的原因停止作用，船舶必须合理尽速地回复原航线并继续其航程。

Deviation or delay in prosecuting the voyage contemplated by the policy is excusedWhere arthorised by any special term in the policy ;or Where caused by circumstances beyond the control of the master and his employer;or Where reasonably necessary in order to ply with an express or implied warranty;or Where reasonably necessary for the safety of the ship or subject-matter insured; or For the purpose of saving human life, or aiding a ship in distress where human life may be in danger; or Where reasonably necessary for the purpose of obtaining medical or surgical aid for any person on board the ship;or Where caused by the barratrous conduct of the master or crew, if barratry be one of the perils insured against

（1）船舶在进行保险单预期的航次中，下述绕航或延迟可允许：保险单中任何特别条款授权许可者，或船长和其雇员不能控制的情况造成的；或为遵循明示或默示保证所合理必须的；或为船舶和保险标的的安全所合理必要的；或为了救助人命或为援助有人命危险的遇难船舶；或为船上任何人员及时得到内、外科治疗所合理必要的；或如果&船长、船员恶意损害被保险人利益的行为&系承保风险，由于该恶意行为造成的。（2）一旦允许绕航或迟延的原因停止作用，船舶必须合理尽速地回复原航线并继续其航程。

To use wild empathy,the bearhound and the animal must be able to study each other,whick means thar they must be within 30 feet of one another under normal visibility conditions.

要使用野性认同，熊猎犬和动物必须能够互相仔细查看，即两者必须在普通环境下彼此相距30尺以内。

Methods: Electronic databases. including MEDLINE, CINAHL, PubMed and CEPS, were searched up until June 2008. Randomized controlled trials were selected using the following criteria: overweight/obese children and adolescents were aged 6-18 years; subjects took part in exercise or physical activities; and, at least one outcome of physiological fitness was studied.

由MEDLINE、CINAHL、PubMed及CEPS资料库利用关键词合并收寻截至2008年6月所有随机控制研究设计(randomized controlled trials， RCTs)、受试者为6-18岁过重／肥胖的儿童或青少年、必须要有运动训练或身体活动介入且必须包含生理适能一项以上测量项目之研究。

Since good Mormons tithe—that is, they give a tenth of their income to the church—the church is colossally wealthy, though its finances are secret. A decade ago, the Ostlings estimated its assets at $25-30 billion, but who knows?

尽管教会的财政收入是保密的，但是因为虔诚的摩门教徒必须缴纳什一税，也就是说他们必须把收入的十分之一交给教会，因此教会掌握了巨大的财富。10年前，他们自己估计总资产在250亿到300亿美元，但是谁能说得清呢？

Since good Mormons tithe—that is, they give a tenth of their income to the church—the church is colossally wealthy, though its finances are secret. A decade ago,estimated its assets at $25-30 billion, but who knows?

尽管教会的财政收入是保密的，但是因为虔诚的摩门教徒必须缴纳什一税，也就是说他们必须把收入的十分之一交给教会，因此教会掌握了巨大的财富。10年前，他们自己估计总资产在250亿到300亿美元，但是谁能说得清呢？

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。