It shows, moreover, that the Chinese artist had mastered the difficult art of representing movement.

此外，它也表明当时的中国艺术家已经掌握了表现运动的复杂技艺。

youdao

Blurring from hand and arm movement is the most common, because keeping these limbs perfectly still for more than a few seconds is difficult.

手和手臂的移动带来的模糊最为常见，因为要好几秒钟保持这些躯体静止是很困难的。

youdao

He asked his subjects to record how long each bowel movement took and rate the effort required on a four-point scale ranging from effortless to difficult.

他要求试验者记录每次排便的用时同时以从易到难用四个等级评估所需力气。

youdao

And an international movement known as hospice has helped bring attention to difficult-to-treat pain for the dying.

VOA: special.2009.02.10

Let's make the red light the symbol of 'go.'" And now with the ecological movement it would be very difficult to make the green light the symbol of "stop," and in any case all sorts of complications would arise. Right?

我们来假设，红灯的意思是出发“,那么难道,绿灯的意思是停止吗？,这样会引起各种不必要的麻烦？

耶鲁公开课 - 文学理论导论课程节选

And,this constant movement of population also affects the humanitarian workers as it makes the planning and the delivery of aid much more difficult because we cannot predict where the people are going or if they are coming back."

VOA: standard.2009.06.21

Years of conflict and population movement make any census difficult.

BBC: Life in Afghanistan

But as more states join the tax-the-web movement, such responses could become more difficult.

FORBES: Connect

However, after the Prescott debacle, Khan concentrated on improving his defense, increasing his lateral movement and getting angles that make him difficult to hit.

WSJ: Boxing Braces for the Wrath of Amir Khan