难得到的

When this hydroxamate-xanthate collectorsystem used to float another highly siliceous pelitic copper oxide ore,a copperconcentrate of 25% Cu can be obtained with recovery of 85% for free copper oxide.

自由氧化铜回收率≥85%，选择合适的调整剂及相应的流程结构更有利于羟肟酸-黄药&混合剂&在Cu-Fe共生难选养化矿浮选中发挥最佳效用，不仅可以得到品位达36%的优质铜精矿。

The results show that the coverage area of tungsten film on diamond surface is above 90% and the steady tungstenic carbides WC and W2C are created by this technology. The tungsten film coated on diamond is realized.

结果表明，该方法可在金刚石表面镀覆上一层覆盖面达到90%以上的金属钨膜，且生成稳定的碳化物WC和W2C，得到由难熔金属钨包覆的金刚石。

Dukkha vedana in the old position is usually very easy to see when yogavacara is working; but sankhara dukkha (pain carried into the new position) is very difficult to see – because the new position usually appears to be a happy one.

明觉起作用的时候很容易体会到旧姿势中的苦苦，但行苦（变换到新姿势所残留的苦）却很难体会得到→因为新姿势通常令人觉得舒服。

Adopting cathode protection of the zinc materials as an effective protection method, which already applied more and more in many field. For example, Hot-dip galvanisation, galvanization, electric arc spray zinc 、sherardizing, etc. But that method are with lots of shortcomings. For example, hard to apply

采用锌材料阴极防护的方式，作为一种有效的钢铁防护手段，已经得到越来越多的应用，诸如热浸镀锌、电镀锌、电弧喷锌、热喷锌等工艺手段，但鉴于这些工艺存在施工难度大、环境污染重、能耗高、锌层受损难修复等弊端，使得发展受限。

These pollutants in water could be biodegraded mostly,even fully through the co-metabolism action by some microorganisms.

水中的难降解有机污染物，可能通过几种微生物的一系列共代谢作用得到大部分，甚至是彻底的降解。

Kruger had. to look after me, had to make broths for me, and so on. It was a trying period for him, more particularly because he was just on the verge of giving an important exhibition at his studio, a private showing to some wealthy connoisseurs from whom he was expecting aid. The cot on which I lay was in the studio; there was no other room to put me in.

克鲁格不得不看护我，为我煮汤喝，为我干别的，这对于他是一段很难的日子，尤其是他马上就要在画室里举行一次重要画展了，这是为一些有钱的鉴定家举办的私人画展，他指望从这些人那儿得到赞助，我睡的帆布床就摆在画室里，再没有其他房间可以安置我了。

Based on low frequency drive system of the DPB550/150 Ⅱ type an intelligent control strategy applied to the speed control of AC mine hoist is described and a satisfactory control performance is obtained. Some problems, such as unsatisfactory control performance of AC coal mine hoist in deceleration and low speed drive period, and the difficulty of obtaining the constant deceleration during changing load, are solved.

以DPB－550／150－I型中国矿业大学低频拖动系统为基础，应用智能控制策略，实现了交流提升机的速度控制，得到了较好的恒减速控制性能，解决了矿井交流提升机在减速段和爬行段的速度控制性能较差以及在负载变动时，很难实现恒减速的问题。

In order to surmount the problem of slow reaction rate of the Baylis-Hillman reaction, we employed N-tosylated imines as the electronphile.

因为醛和环状烯酮的反应很难进行，我们便用活性更高的亲电试剂磺酰亚胺代替醛进行Baylis-Hillman反应，取得了很好的结果，反应速度得到了很大的提高。

Different frequency and density of INA bacteria were showed in the different parts of tea plant.

此外，在雨水较多、湿度较大的季节茶树上冰核细菌的密度较高，而在干燥寒冷的时候则较难分离得到冰核细菌。

Desperately tricky to make,disastrous should you get it wrong.One sip and you will find that all of your endeavors succeed.At least until the effects wear off.So this is what I offer each of you today.One tiny vial of liquid luck to the student who,in the hour that remains…manages to brew an acceptable Draught of Living Death…the recipes for which can be found on page 10 of your books.I should point out,however,only once did a student manage to brew a potion…of sufficient quality to claim this prize.Nevertheless,good luck to you all.Let the brewing commence.

这种药很难熬，如果熬坏了会大难临头，只要喝一小口就会事事顺心，至少在药效发挥的时候，这就是我今天给你们的奖品，你们谁能在一小时内，熬出一罐子活死水，那我就送他一小管这种神奇的幸运水，详细步骤都在书里第10页，不过我要强调，熬得最好的那个学生，才能得到幸运水，不说了，祝大家好运，大家开始吧。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。