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Trading is one of the most basic activities of mankind. It has existed in every society, every part of the world, and in fact every day since the caveman came into being.

贸易是人类最为基本的活动之一，每个社会都有贸易活动，并存在于世界各地，事实上，从洞穴人开始就已经有了贸易交往活动。

Variations in G are not only present in Cavendish experiments and free fall setups.

G 值的变化并不仅仅存在于 Cavendish 的实验和自由落体装置中。

The beauty of the use of Cayley diagrams is that one can make good use of this connection.

使用Cayley 图解的妙处在于，我们可以很好地利用这种联系。

China is a very important market for Celanese. It is a key link in our global business strategy and a significant contributor to our growth and development.

对塞拉尼斯而言，中国的重要战略意义不仅在于它是我们全球发展战略上的关键一环，同时也是公司未来发展的重要动力。

However, the application of the natural cellulose is far less than that of the synthesized cellulose.

其最大的优势在于它是可再生的、可生物降解的、生物相容性的和可衍生化的。

It is well know that the biological basis of Orthodontics is the plasticity of jaw, the strength-proof of cementum and the stability of periodontal ligament internal environment.

口腔正畸学的生物学基础在于颌骨的可塑性、牙骨质的抗压性及牙周膜内环境的稳定性。

A central difference between the two arises from the fact that Espiritu focuses on institutions , while Liu focuses on culture .

但两人论点主要之分歧在于：Espiritu强调机构体制的运作，而刘则聚焦在文化意涵。

The problem is that conversion of the foreign currency into yuan would put upward pressure on the yuan and so force the central bank to buy yet more foreign currency to hold it down.

问题的关键在于将外汇兑换成人民币将带来人民币升值的压力，并迫使央行购买更多的外汇来稳定币值。

First of all, we indicate that the weakness of traditional network management is its centralized control pattern.

本文首先分析了传统网络调度、分配方法的弊病，指出了它不适合于网络发展的一个重要原因在于其高度集中控制的模式。

The flat has the virtue of being centrally heated.

这套公寓的优点在于中央供暖系统。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。