难

You can always juice sales by going down-market, but it's hardto go back upmarket.

当市场下跌时，你轻易的将好东西打折变卖，但是一旦市场向上，再想买回来，难之又难。

You can always juice sales by going down-market, but it''s hard to go back upmarket.

当市场下跌时，你等闲的将好工具打折扣变卖，可是一朝市场向上，再想买回来，难之又难

"Oh, God," thought Scarlett drearily , that's just the trouble.

"啊，上帝！"思嘉沮丧地想，难就难在这里呀。

This paper contributes to experimental study and practice on treatment of organic wastewater by a new electrochemist reactor- bipolar packed bed cell.

本文是一种新型电化学反应器—复极性固定床电解槽(bipolar packed bed cell简称BPBC)处理难降解有机物的研究，对于难降解有机物处理技术的提高具有积极的意义。

Liang Kai was the epigone of PPG for a time 2007, but the heat of pursuit lasted only 2 months, because he discovers the mode of PPG crosses category very hard to run: It is easy to sell a shirt, but it is very difficult to sell other product, he hopes to do a platform that has expansibility more.

2007年梁凯一度是PPG的追随者，但追求的热度只持续了2个月，因为他发现PPG的模式很难跨品类运作：卖衬衫容易，但卖其他产品很难，他更希望做一个有扩展性的平台。

It is fabulously difficult to describe and very difficult to manage.

企业个性很难描述，而且很难把握。

It's a bit easier because you don't have to detect and configure your own hardware. Ironically, it's simultaneously harder because correctly handling Plug and Play and power management is fiendishly difficult.

简单的是您不必对硬件进行测试和配置，但难的是正确处理即插即用和电源管理，而且非常之难。

Predators look down from the top of the water, as the black back of the fish and river mud the same color, it was hard to find; natural enemies from the water at the bottom up, due to the days of color and white fish maw Almost, so it is difficult to be found; often see some article described the early morning hours of "float to the surface of the East Yu Dubai," This is the reason.

天敌从水上方往下看，由于黑色的鱼背和河底淤泥同色，故难被发现；天敌若从水下方往上看，由于白色鱼肚和天颜色差不多，故也难被发现；经常看到有些文章里形容清晨时分"东方泛起了鱼肚白"，就是这个道理。

And it is based on the international standard of the"Test method for flame resistance of pressure-sensitive adhesive tapes-Suspension way",and the international standard of the"Fire hazard testing for electric and electronic products-Test method of needle-flame".

实际结果证明，如果胶粘剂的难燃性能可以通过该标准的要求，则当它被用来粘接电子电工零部件、元件时，不会降低产品的整体难燃等级。

Ta,Mo,W,Ti,Nb,the refractory impurity elements,in RE metals are dissolved thoroughly with the addition of fluoric acid,and then determined by ICP-MS.

在稀土金属的冶炼过程中，常用到一些由难熔金属制成的冶炼容器，这样极易引入相应的难熔金属杂质，如Ta、Mo、W、Ti、Nb等。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。