四分之一

Because Betelgeuse is expanding in size while losing mass, its density has become very low: the star is now about a billion times less dense than the air on Earth.

由于参宿四的体积在不断扩大，质量却在不断减少，其密度最后变得非常小：目前的密度是地球上空气的十亿分之一。

Townes, who turns 94 in July, plans to continue monitoring Betelgeuse in hopes of finding a pattern in the changing diameter, and to improve the ISI's capabilities by adding a spectrometer to the interferometer.

在参宿四质量流失的过程中，其体积处于膨胀状态，密度也变得非常低，目前这颗恒星的密度仅是地球空气密度的10亿分之一。

Inverted surcharge of "temporarily used for" 2c on 3c junk 1st peking print, used on piece, tied by shanghai dater on sep 24, 1924, this stamp has the same position from the setting as that listed on p.270 of "prize selections爁rom the rocpex taipei'81", only about 20 pieces believed to exist, well-known as one of the "four rarities of republic of china", from overseas collector, extremely precious, vf rmb:

贴北京一版帆船加盖"暂作"改值邮票2分/3分倒盖变体剪片，销上海1924年9月24日戳，颜色鲜艳，齿孔完整，此票与台湾《邮展选萃》270页图为同一位置版式，存世仅二十枚左右，为"民国四珍"之一，此票源自海外藏家，首次在中国大陆拍卖会上出现，极少见，上品

It was wholly in the lower ice, but close against the upper, and was flattish, or perhaps slightly lenticular, with a rounded edge, a quarter of an inch deep by four inches in diameter; and I was surprised to find that directly under the bubble the ice was melted with great regularity in the form of a saucer reversed, to the height of five eighths of an inch in the middle, leaving a thin partition there between the water and the bubble, hardly an eighth of an inch thick; and in many places the small bubbles in this partition had burst out downward,and probably there was no ice at all under the largest bubbles,which were a foot in diameter.

在气泡之下和周围已经结了一层新的冰，所以气泡是在两片冰的中间；它全部是在下层中间的，却又贴近上层，扁平的，也许有点像扁豆形，圆边，深四分之一英寸，直径四英寸；我惊奇地发现，就在气泡的下面，冰溶化得很有规则，像一只倒置的茶托，在中央八分之五英寸的高度，水和气泡之间有着一个薄薄的分界线，薄得还不到一英寸的八分之一，在许多地方，这分界线中的小气泡向下爆裂，也许在最大的直径一英尺的气泡底下完全是没有冰的。

Pennsylvania high school quarterback Terrelle Pryor says he is going to OhioState. He announced his decision at Jeannette High School, where he had one of the greatest prep careers in the s tate's history.

Pennsylvania高中四分卫Terrelle Pryor 称他将前往Ohio州，他在Jeannette高中声明了他的决定，在那里他曾进行了州历史上最棒的职业前准备之一。

The Jura, the Plateau and the Alps form the three main geographic regions of the country.

瑞士人口有七百四十万，只占全球人口总数的千分之一。

Pounds plus 2 1/2 % interest on the same, repayable quarterly in equal annual instalments until extinction by amortisation of loan advanced for purchase within a period of 20 years, amounting to an annual rental of 64 pounds, headrent included, the titledeeds to remain in possession of the lender or lenders with a saving clause envisaging forced sale, foreclosure and mutual compensation in the event of protracted failure to pay the terms assigned, otherwise the messuage to become the absolute property of the tenant occupier upon expiry of the period of years stipulated.

房屋到手后，同时付总价的三分之一，余额——也就是八百英镑外加二分五厘利息——每年分四季按同额偿付，二十年内全部还清。年额连本带利，相当于六十四英镑的房租钱。不动产权利书上还附加着条款：如上述款项逾期不交，则强制售出、执行抵押权或相互赔偿等。房地契由一至二、三个债权者保存，如无滞交情况，该座宅院届期即成为租房者的绝对所有财产。

After a third winter Poyarkovreturned to Yakutsk with fewer than a quarter of his 160 men.

又经历了一个冬天之后，波亚尔科夫回到了雅库茨克，160人只剩下不到四分之一。

Trucks weave through sand dunes in the Ar Rub' al Khali desert, also known as the Empty Quarter, in the Arabian Peninsula.

卡车组合穿过沙丘在Ar Rub' al Khali沙漠，同样知名的如倒空的四分之一，在阿拉伯的半岛。

Patterns in Nature: Aerial Views Trucks weave through sand dunes in the Ar Rub' al Khali desert, also known as the Empty Quarter, in the Arabian Peninsula.

那些卡车组合穿越沙丘在（Ar Rub'al Khali）沙漠，正如大家所知，这块沙漠占阿拉伯半岛的四分之一。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。