困难

We know how to tie a bow knot but have trouble telling others how to do it.

我们自己都会打领带，可是，如果要告诉别人怎么打领带，却往往会有困难。

He is not one to bow before difficulties.

他不是一个向困难低头的人。

He is not one of those who bow before difficulties.

他不是那种在困难面前低头的人。

He is not a man to bow before difficulties.

他不是一个向困难低头的人。

Patient: That's going to be difficult — I'm a boxer.

病人：那将是困难的，因为我是一名拳击手。

In the dissertation, principles of phase-shifted full-bridge ZVS PWM and push-pull boost converter are analyzed; Reason of duty ratio dropping out and solution measures are introduced at the same time; The magnetic biasing and ZVS methods of Lagging brachium are studied detailedly in the bidirectional DC converters.

在本文中首先分析了移相全桥式ZVS-PWM功率变换和推挽式DC／DC Boost功率变换的工作原理，分析了移相全桥式滞后臂实现零电压关断困难以及占空比丢失的原因以及采取相应的改善措施，分析了双向DC／DC变换器产生偏磁的原因以及采取抗偏磁的措施。

The first large shipment of moths succumbed to a disease. Growing enough bracken indoors is difficult.

首批船运而来的大量飞蛾死于某种疾病；在室内种植足够的欧洲蕨也很困难。

Carrie Bradshaw: Sweetie, you shit your pants this year. I think you're done.

"心碎和分手是最困难的事，忍受这些不该得到掌声吗？"

The designated verifier signature scheme was proposed using the root problem and conjugacy search problem in the braid group. Analysis shows that it is a simple, fast and efficient scheme with security features.

介绍了辫群的基本概念和辫群中的困难问题，在此基础之上，利用辫群中左右子群的元素可交换性，提出了一个基于辫群上的共轭查找问题和p次根问题的指定验证者的签名方案，通过分析可知，该方案具有简单实用、算法速度快和高效安全的特性。

We describe the algebraic characteristic of the public-key cryptosystems based on algebraic structures such as elliptic curves,bilinear pairings,as well as braid group s,with the emphasis on the difficulties of constructing public-key cryptosystems based on non-commutative algebraic structures.

通过分析基于椭圆曲线、双线性对以及基于辫子群的公钥密码体制的代数学特征，着重讨论了构建基于非交换代数的公钥密码体制所面临的困难。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了