难以

This was complicated by the fact that the bracket was round and difficult to maneuver in the drill press.

这是复杂的事实，即括弧内是全面和难以演习，在演习的新闻。

Security, once one of the main reasons for huddling together, is often now more elusive in the druggy streets of the metropolis than in the exurbs.

安全一度是群居生活的重要动机。而如今大都市毒祸横流，安定的生活相比城郊更使人难以捉摸。

But one obstacle is the poor programming environment of software DSM system.

其优点是在消息传递的系统上实现共享存储的编程界面，主要问题是难以获得满意的性能。

Security domain separation based on DTE policy is one of the basic technologies to build trusted system.

但现有DTE实现系统存在安全目标不明确、缺乏对系统及其安全性质的形式定义和分析的缺点，导致系统安全性难以得到保证。

Because of the dual trends and their complex nonlinearity,the seasonal load which is also subject to multiple stochastic interference factors is difficult to be forecasted with single model.

季节型负荷具有增长性和波动性的二重趋势，并且呈现出复杂的非线性特征，同时又受到多种随机干扰因素的影响，难以用单一的预测模型做出准确的预测。

Day after Day in Dublin i'd want to.

但是他有时会让我难以应付，我能怎么办？

These are due to your love for your hard.

这些都是因为对你的爱对你的难以释怀。

The main works in this paper are as follows:(1). In this thesis, a new method, continuous linearization model, is constructed for the non-linear dynamic systems. The precision Duhamel integration solution for the linearization equation is also given from the theory of linear differential equation. The calculating results show that the new method can improve the calculation precision greatly. In fact, the truncation error is not limited by this method, it can arrive the precision according to the requirement.

本文的主要工作有以下几个方面：(1)由于非线性项的存在，使得多数情况下难以得到非线性动力方程的解析解表达式，目前常使用数值积分方法来求解非线性动力学方程的解，但常规计算方法的计算精度不很理想，本文提出了含Taylor展开项中高阶余项的非线性动力方程的线性化数值计算方法，构造了瞬态线性化方程，给出了Duhamel积分的表达式。

Dumbly, they give us encouragement and the stages, that is hard for us to repay even use our whole lives.

是你们默默地鼓励我们，给我们搭建了成长的舞台。你们对我们的养育之恩，是每一个儿女用一生都难以报答的。

This accuracy cannot be duplicated even with the aid of modern technology.

这样的精确度，即使是利用现代科技也难以复制。

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％。