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What we have learned is that it is difficult to control costs piecemeal and just as difficult to expand access using an incremental approach.

我们所了解的是，很难控制成本和片面的，正如难以拓展采用渐进的办法。

As the innovation of the paying land using system deepening, many academicians have studied intensively on the appraisal of urban benchmark land-value, however, because there is large otherness in all regions of cities, in the idiographic remise and attorn, it is very difficult for the benchmark land-value to guide and control the land price, the influence factors of the land price are complicated and are difficult to be appraised, so the research on the land price appraisal is very little.

随着土地有偿使用制度改革的深入，许多学者对城市基准地价评估工作进行了深入的研究，然而，由于城市内部各区域的差异性很大，在具体的出让、转让活动中，基准地价很难指导、控制宗地地价，而且宗地地价的影响因素复杂，评估困难，因此研究亦少。

Canines are considered one of the more difficult mammals to clone because of their reproductive cycle that includes difficult-to-predict ovulations.

犬类被视为较难复制的一种哺乳类动物，因为它们的繁殖周期中包含了难以预测的排卵过程。

It is difficult to exercise self-control, that is , difficult to keep within limits.

自己很难控制，即很难控制在一定的范围之内。

Large flat networks can also be difficult to troubleshoot, and advanced security can be difficult to implement.

对大型平面网络的故障诊断很困难，先进的安全性也难于实现。

The results show that jamesonite and pyrrhotite have good floatability in the pH range of 2-10 and marmatite has good floatability in the acid and it is difficult to separate these minerals. In the pH range of 6-8, the separation of jamesonite and pyrrhotite, marmatite is possible when using mercaptoacetic acid and mercaptoethanol as depressants. In case of the presence of Cu2+ ion, however, it is difficult to separate the three minerals. Infrared spectrum demonstrates that there are a number of function groups such as —SH,—COOH,—OH in the molecular structure of depressant.

结果表明：用丁黄药作捕收剂，脆硫锑铅矿和磁黄铁矿在pH 2~10范围内都有良好的可浮性，铁闪锌矿在酸性条件下可浮性好，三者分离困难；在pH 6~8之间，采用巯基乙酸和巯基乙醇作抑制剂，脆硫锑铅矿与磁黄铁矿和铁闪锌矿的分离是可能的；但铜离子存在时， 3种矿物之间的选择性分离是难以实现的。

In recent years, the stretcher bars flower survival, development of basic changes in society, some quite accomplished stage veteran artists gradually quit or die, and some skills difficult to obtain transmission and development, carried flower development Periploca difficult to save much-needed protection.

近年来，抬花杠赖以生存、发展的社会基础发生变化，一些颇有造诣的老艺人逐渐退出舞台或谢世，有些绝技难以得到传承和发展，抬花杠的发展举步维艰，亟需抢救保护。

However, it is difficult to know the 3D structure of TSB and HSTP by forming single crystal because their tortuose structures are difficult to crystalize.

2在分析和总结了实验中已合成的PPV 齐聚物光电性质及其优缺点的基础上，我们设计了三种含有PPV 齐聚物结构的分子。

Real estate is the hot spot last year, but also because difficult to become difficult to resolve.

房地产是去年的热点，而且还因为很难成为难以解决的。

Alternatively, the test power may be reduced if we analyze these variables one by one, and the results are also difficult to explain, moreover, it is difficult to compare these results with that from the analysis on the dichotomized variable.

针对这些问题，本文提出了以广义最小二乘法原理处理同胞对数据间的相关性，以多元响应回归的方法处理多个性状数据间的相关性的多元性状同胞对连锁分析方法。

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％。