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Therefore in order to achieve high-yielding alfalfa, we must do a good job of prevention and control weeds.

因此要实现苜蓿的高产，必须做好杂草的防治工作。

Aiming at OQL, we treated type as monoid (collection monoid and primitive monoid), and used monoid comprehension as OQL's intermediate representation. Therefore we can merge the rewrite rules for a number of collection types, then employ monoid comprehension in defining algebraic operators, as cut out the limit that in relational algebra/calculus algebraic operators are only for set.

针对ODMG-2.0的对象查询语言OQL，我们把类型提高到幺群级，然后从幺群概括入手，用幺群概括作为OQL的查询中间表示，统一了多种聚集类型的重写规则，幺群概括还被我们用于定义代数操作符，这使得代数操作符突破了关系代数/演算中只针对集合的局限。

Therefore, the property, of Pascal line is important for both algebraic curve and singularity of spline space The aim of this paper is to find common properties among conic curves which have the same Pascal line and compute the track of Pascal lines.

所以，对于Pascal线性质的讨论，对于代数曲线以及多元样条空间的结构方面的研究也起着重要作用。

It i s evaluated that the overland mobility of tanks produced by different countries and during different periods with very simple algebraic operation. The conclusi ons obtained agree with the results verified by other evaluating methods and the actual using situation of tanks in battlefield. Therefore, the method is proved to be valid.

本文采用简单的代数运算对不同国家同一时期坦克陆上机动性能的比较和对同一国家在不同时期坦克机动性能进行效能评定，所得结论与其它方法评定结果和坦克在战场上长期使用的实际情况一致，从而验证了本方法的有效性。

In the method, a optimization model of a ventilating network is put forward by taking the minimizing squared sum of algebraic sum of the ventilation pressure of all branches in a independent circuit about all independent circuits as object function, therefore a new algorithm of ventilation network optimization is obtained.

该方法通过使所有独立回路分支风压代数和的平方和最小化的方法，建立了通风网络解算优化模型，并用梯度法对该模型进行解算，获得了一种新的风网解算算法。

In the method, a optimization model of a ventilating network is put forward by taking the minimizing squared sum of algebraic sum of the ventilation pressure of all branches in a independent circuit shoot all independent circuits as object function, therefore a new algorithm of ventilation network optimization is obtained.

该方法通过使所有独立回路分支风压代数和的平方和最小化的方法，建立了通风网络解算优化模型，并用梯度法对该模型进行解算，获得了一种新的风网解算算法。

It was therefore ironic that his most famous achievement was to build a typewriter at the request of the defence lawyers for Alger Hiss, who was accused in 1948 of spying for the Soviet Union.

因此，极具讽刺意味的是，泰特尔最著名的成就是应Alger Hiss的辩护律师的请求制造一台打字机。1948年，Alger Hiss被指控是苏联的间谍，他的律师想证明打字机能够被制造的非常相像，用以诽谤某人。

In normal cases, therefore, a alid offer and a alid acceptance of that offer must be indentified.

因此在一般的案件中，必须对有效要约和与要约对应的承诺加以识别

In addition to the maintaining of the functions of mother and child's cardiovascular system. Sufficiency supply alimentation of high quality nutritional oils the mother and child required during pregnancy. Therefore, the highly nutritious tea seed oil is important to the proper growth of a fetus.

孕妇吃易消化、高营养的茶叶籽油可减轻消化系统的负担，轻松解决孕妇便秘，促进人体新陈代谢，维护母子心血管系统的正常功能，充分补充妊娠期间母子所需的高质量油脂营养，对胎儿的正常发育十分有益。

Therefore, they make people keep healthy and prolong life only keeping alkalescence at the time of supplementing water in the cells and strengthening anti-oxidative capacity.

所以只有在补充细胞内水份的同时保持弱碱性，并增强抗氧化能力才能使人保持健康、延年益寿。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。