四个

The reaction of pyrrole with asymmetric ketones has been investigated and sixteen new functionalizedcalix[4]pyrroles have been synthesized and characterized.

本文探讨了非对称脂肪酮与吡咯的反应，合成了16个新型功能化的杯[4]吡咯化合物，解析了四个杯[4]吡咯和其包结物的晶体结构。。。

So basically we could draw a quadrangular polygon instead of four points, like below, where we are instancing ten grids

那么 我们可以简单的画一个四边的多变形代替四个点，像下图一样。在图中，我们代理了10个grid

The isothermal solubility diagram of the quinary system NaVO_3 + KVO_3 + NaH_2PO_4 + KH_2PO_4 +(NH_2)_2CO + H_2O consists of four invariant points, six univariant cuives, and five regions of crystallization corresponding to NaVO_3, KVO_3, KH_2PO_4, NaH_2PO_4 and (NH_2)_2CO.

五元体系NaVO_3+KVO_3+NaH_2PO_4+KH_2PO_4+(NH_2)_2CO+H_2O298K下的等温相图由五个相区、六条单变量线和四个零变量点组成。

In metastable equilibrium phase diagram of quinary system Li+, Na+, KV/C032, B4O72 -H2O at 288K, there are six crystallization fields (saturated with Li2CO3): K2CO3 -3/2H2O, Na2CO3 MOHjO, NaKCO3 -6H2O, K2B4O7 5H2O, Li,B2O4 -16H2O and Na2

五元体系Li~+，Na~+，K~+∥CO_3~(2-)，B_4O_7~(2-)—H_2O 288K稳定相图中，有六个Li_2CO_3饱和的结晶区：K_2CO_3·3／2H_2O，K_2B_4O_7、·4H_2O，Na_2CO_3·10H_2O，Na_2B_4O_7·10H_2O，NaKCO_3·6H_2O及Li_2B_4O_7·3H_2O；九条单变度曲线及四个无变度点。

A closed railroad car used for carrying baggage or freight.

有前后座的两个或者四个车门的小汽车。

A ranch house usually has three or four bedrooms. The "master bedroom" for the mother and father usually has IT s own bathroom.

牧场式平房住宅通常有三个或四个卧室，父母住的主卧室通常有自己的浴室。

Four eunuchs of the fifth rank in front and twelve eunuchs of the sixth rank walked behind.

四个第五级别的太监走在前面，十二个第六级别的太监跟在后面。

4 P recision Control System: Level or horizontal tube with water level measurements in the wall outside the library on two axes for four points, falling to do with the vertical line measurement.

4 精度控制系统：用水准仪或水平管测量水平面，在库壁外两个轴线上设四个点，用线坠可做垂直度的测量。2。

The system consists of four stages: foreground segmentation, head extraction, facial component identification and recognizability measurement.

我们所提出的系统，分成为四个部份：前景侦测、头部区域撷取、人脸特徵侦测、可辨识度计算。第一个部份，先以一个统计式的方法来建立背景模组。

Four little nigger boys going out to sea;A red herring swallowed one, and then there were three.

四个小黑人到海边，一条红色的鲱鱼吞下还剩下三个。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。