四分之三

Using the infinite product of unevenly distributed probability space with potential of 3, the concept of formula truth degree was introduced into the Gdel 3-valued propositional logic system. Moreover, it was proved that in the 3-value (1/4, 1/2, 1/4), measure the set of truth of degree of propositions was dense in [0, 1], and a general expression of truth degree was obtained, providing a basis for further developing approximate reasoning of 3-valued propositional logic system.

利用势为3的非均匀概率空间的无穷乘积，在Gdel三值命题逻辑系统中引入公式的真度概念，在三值逻辑(四分之一，二分之一，四分之一)测度下证明G3中全体公式的真度值之集在[0， 1]上是稠密的，并给出公式真度的表达通式，为进一步在三值命题逻辑系统中展开近似推理奠定基础。

4 Is a rational fraction .But 1/3 is a irrational fraction.

四分之一是真分数，而三分之一是假分数。

Between a quarter and a third of people in the UK are shortsighted.

之间的四分之一和三分之一的人在英国，是短视的。

One of her proudest finds is a Portuguese colonial walk-up just off Macao's porto interior , or "inner harbour", which has plenty of local colour in the form of a nearby fish market and a brothel.

对于想寻找更奇特房产的买家而言，有一些年代较久、需要翻新的房子。在路环村，四分之一到三分之一的住宅是没人居住的，而且处于各种失修状态。

And the small-business sector is wrapped in cotton wool, encouraging "replicative" rather than "innovative" behaviour.

在过去的四分之一个世纪中，日本所创建的新公司比例仅占美国的三分之一到二分之一。

The country accounts for about a fifth of the world's population, yet it gobbles up more than half of the world's pork, half of its cement, a third of its steel and over a quarter of its aluminium.

这个国家拥有世界五分之一的人口，然而却消耗了全世界一半以上的猪肉、一半的水泥、三分之一的钢铁和超过四分之一的铝。

The countryaccounts for about a fifth of the world's population, yet it gobbles upmore than half of the world's pork, half of its cement, a third of itssteel and over a quarter of its aluminium.

这个国家有世界人口的五分之一，但它消耗了全世界半数以上的猪肉，半数的水泥，三分之一的钢材和四分之一的铝材。

The country accounts for about a fifth of the world's population, yet it gobbles up more than half of the world's pork, half of its cement, a third of its steel and over a quarter of its aluminium.

这个占据全世界五分之一人口的国家，消耗了全球一半的猪肉和水泥，三分之一的钢铁和四分之一的铝。

The country accounts for about a fifth of the world's population, yet it gobbles up more than half of the world's pork, half of its cement, a third of its steel and over a quarter of its aluminum.

这个占世界人口五分之一的国家，每年吃掉了全世界超过一半的猪肉，消费掉一半的水泥，还有三分之一的钢铁跟四分之一强的铝。

This invention relates to a method and device for generating cold atomic beam. Said method includes heating hot atom source in vacuum chamber to form atomic saturated vapor pressure atmosphere, cooling hot atom by three-D MOT to below 200uk and trapped to form cold atomic cloud, by the quarter wave plate reflection mirror in MOT the laser radiation pressure being unbalanced to make cold atom emitting along said direction, four tape arranged straight line set with contrary current direction is set in atom beam emission direction, which makes the atom emitted to forward to obtain cold atom beam with low speed, large flux and small transverse speed, laser beam vertical with atom beam set in the direction of cold atom emitting for atom beam state preparation to realize state concordant emitted cold atom beam.

本发明涉及一种冷原子束产生方法和装置，该方法包括在抽真空的真空室内，加热热原子源，在真空室中形成相应的原子饱和蒸汽压气氛；采用三维MOT对热原子进行冷却，冷却到200μk以下，并被捕获形成冷原子云团；通过三维MOT中开小孔的四分之一波片反射镜，而使得在该方向上激光辐射压力不平衡，使冷原子沿此方向出射；在冷原子束出射方向上，还置有载有彼此电流方向相反的四根成锥形排列的直导线，从而原子出射时将在磁场的作用下，不会沿横向膨胀而向前射出；便得到了出射速度低的、通量较大的、横向速度非常小的连续冷原子束；同时在冷原子束的出射方向上，设置有与原子束垂直的激光束，用于原子束的态制备，实现态一致的出射冷原子束。

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。