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The reason of low system efficiency of the mechanical lifting is: unavailable match between transformer and asynchronous motor with large capacity of equipment and large self-consumption; large average no load less of Y series electrical machinery (31.4% of the total oilfield electrical machinery) with 2.86kw; limited adjustable extent of stroke of the electrical machinery in low-liquid produced wells with minimum value of 4 times per minute for limitation of minimum rotation of the electrical machinery and minimum arc of contact of pulley. Energy consumption will be waste for 1 to 1.5 times per minute is enough.

分析显示，造成抽油机系统效率低的原因主要是：变压器与异步电动机之间匹配方式不合理，设备容量大，自身损耗大；占油田电机总量31.4%的Y系列电机的平均空载损耗大，为2.86kW；低产液井电机的冲次可调范围有限，受电机最低转度和皮带轮最小包角限制，其最小冲次仅可调到4次／min，但1~1.5次／min的冲次即可满足生产需要，造成能耗浪费。

As an inducement the city is enticing landholders to surrender their claims on their rural plots in exchange for prized urban residency permits that offer not only legal residence in a city, but also access to social services and benefits unavailable in rural areas.

城市作为一个诱因吸引着土地所有者放弃他们在农村的的小块土地，进而作为交换城市居民许可的条件。这个城市户口不仅意味着可以作为城市的合法居民，并且还能享受到农村所不能享受到的社会服务和好处。

As an inducement the city is enticing landholders to surrender their claims on their rural plots in exchange for prized urban residency permits that offer not only legal residence in a city, but also access to social services and benefits unavailable in rural areas.

文章报道：余海，一个长着娃娃脸的二十五岁男子，他今年四月份独自从家乡四川来到重庆，希望能赚到足够多的钱来帮助他家中已经七十岁但仍坚持田间劳作的父亲。

But this diamond is unavailable for almost all the lovestruck men, to be precise, it is 50 light-years far away.

但是这颗钻石是绝大多数热恋中的男人怎么也够不着的——精确的说距离有50光年。

I did figure out how to properly use the wonderful Sichuan peppercorns -- which were until recently unavailable in the U.S.

但我总算学会了如何正确使用美妙的四川花椒─这种调料最近才可以在美国市场里买到。

However, it is unavailable that how the artery and AEC response to changes in WSS after altered arterial flow.

然而，对于动脉血流改变后，AEC乃至动脉如何响应于WSS的变化，尚缺乏足够的认识。

However, in natural ecosystems phosphorus tends to disappear during the course of elemental cycle in chemosphere, meanwhile most of phosphorus in soil is unavailable to plants, and phosphorus fertilizer use efficiency was always not higher than 20 percent, as a result there is a profound significance to exploit the huge soil phosphorus bank and improve fertilizer use efficiency via biological ways.

然而，自然磷矿资源正趋于耗竭，与此同时，土壤中的磷大部分以植物难以直接利用的形态存在，并且投入土壤中的磷肥利用率一般不足20％。

C.B. Delaney --This text refers to an out of print or unavailable edition of this title.

C.B。争议——这就是指一个绝版或无法获得版的标题。

During the War of 1812, British tea became unavailable , and it was then that coffee took over .

在1812年战争期间，因为买不到应该的茶叶，所以咖啡就取而代之。

In earlier studies his research team have noted a remarkable absence of cardiovascular disease and diabetes among the traditional population of Kitava, Trobriand Islands,特罗布里恩群岛 Papua（巴布亚岛 New Guinea, where modern agrarian-based food is unavailable.

他带领的研究小组在早期的研究中就注意到新几内亚巴布亚岛和特罗布里恩群岛的卡塔瓦民族没有人患心血管疾病和糖尿病。而这两个地区没有耕地为主的食物。

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。