Improving certification has played an important role in their social mobility.

Study on the Types and Significance of Population-structured Social Mobility in China

中国人口结构性社会流动的类型和意义初探

An Analysis of the Characteristics of Central Shanxi Merchants and Social Mobility

晋中商人的角色特征与阶层流动分析

On Some Issues about Social Mobility in the Imperial Society ( A General Account);

关于科举社会流动讨论中的几个问题（概述）

One of the best things you can do any time in the semester is go see the professor.

这学期你能做的最好的事情之一就是去见教授。

As a result, their math grades overtook those of the other students by the end of the first semester--and the gap between the two groups continued to widen during the two years we followed them.

结果，他们的数学成绩在第一学期结束时超过了其他学生的成绩——而且在我们跟进调查他们的两年中，两个小组之间的差距不断扩大。

Wolverton said he spent$ 500 on access codes for digital books and programs this semester.

沃尔弗顿说他这个学期在数字课本的和程序的访问代码上已经花了500美元。

With a traditional textbook you can sell it for$ 30-$ 50 and that helps to pay for your new semester's books.

一本传统的教科书你能卖到30美元至50美元，这些钱能帮你购买新学期的书。

Mr. Jobs dropped out of Reed College after only a semester and traveled around India in search of spiritual enlightenment, before returning to Silicon Valley to found Apple with his friend, Stephen Wozniak, an engineering wizard.

他仅仅上了一个学期的课便从瑞德学院辍学，从此便游历印度寻找灵感，之后才回到硅谷和他的朋友史蒂芬·沃兹涅克，一个工程界的奇才，共同创办了苹果公司。

The Athletic Department is looking for students to help assist staff during the Fall 2016, Winter 2016-17 and Spring 2017 semesters ．

体育系正在寻找能在2016年秋季、2016-17冬季和2017年春季学期帮助工作人员的学生。

Although going to college is supposed to be a full-time job, students spent, on average, only 12 to 14 hours a week studying and many were skating through their semesters without doing a significant amount of reading and writing.

尽管上大学应该是一份全职工作,但学生们平均每周只花12到14个小时学习,许多人在整个学期都在划水,没有做大量的阅读和写作。

Rabbits in both groups were ligated of the left anterior descending coronary artery below the left auricular appendage to establish myocardial infarction models. The successful myocardial infarction models were recognized by arc-like elevation of the S-T segments in electrocardiogram ( EKG).

两组兔均于左心耳下缘结扎前降支冠状动脉左前降支建立心肌梗死模型，心电图出现S-T段弓背样抬高为结扎成功。

Objective To investigate the distribution pattern and content of collagen fibers of atrium cordis in children with normal and ventricular septal defect.

目的探讨正常和室间隔缺损儿童心房胶原纤维的分布及其含量。

One case was of gallbladder absence, bilateral left bronchi and single atrium cordis.

婴幼儿单侧听神经瘤1例无胆囊，双侧左支气管结构并单心房。

Methods An experimental pulmonary embolism model in rats was made by injecting coagulated thrombus in vitro into right atrium cordis through a conductor.

方法采用改良的导管方法将体外已凝的大鼠血栓注入右心房制备大鼠急性肺栓塞模型。

The results of digital image analysis showed that the content of collagen fibers of atrium cordis increased obviously in children with ventricular septal defect ( P0.01).

数字图像分析表明，室间隔缺损组胶原纤维的含量均较正常明显增多（P0.01）。

Histological architecture and digital image analysis of collagen fibers of atrium cordis in children with ventricular septal defect

室间隔缺损儿童心房胶原的组织学和数字图像分析

Results: Pericardiography showed that the heart was surrounded by effusion, the heart especially atrium was pressed when cardiac tamponade was present.

结果：心包造影后显示心脏被积液包裹，有心脏填塞症状者，可见到心脏受压，且以心房为著；

Negative inotropism of the effect of feso_4 on isolated guinea pig heart atrium endocardial endothelium modulates lysophosphatidylcholine induced positive inotropism

硫酸亚铁对豚鼠离体心房肌负性肌力作用心内膜调控溶血磷脂酰胆碱的正性肌力作用

The corrugated rubber case and it's mold designing are introduced in this paper.

介绍波纹式橡胶套的产品和模具设计过程.

Some$ 5.6 million was lost by PayPal alone.

仅贝宝一家公司就因此损失了560万美元。