Other experts have said the Microraptor probably flew with its back wings a little under and in a direction like that of the front wings.

VOA: special.2010.03.16

This particle is constantly changing its direction, but it therefore has an acceleration and the acceleration, we have shown here, is pointing towards the center.

这个质点恒定地改变它的运动方向,因此它具有加速度,而且这个加速度,我们前面也讲过了,指向圆心

耶鲁公开课 - 基础物理课程节选

The fact that when you go in a circle, you accelerate is what we're learning here, coming from the fact that velocity is a vector and its change can be due to change in the magnitude or change in direction.

而当你做圆周运动时你也在加速,这是我们在这里所学到的,原因就在于,速度是一个矢量,其变化可以通过改变模长,或者方向来实现

耶鲁公开课 - 基础物理课程节选

"It would really be a mistake, and I am sure the United States would not go in this direction, to give Hamas that authority on its own."

VOA: standard.2010.06.10

"Avatar" earned three Oscars - for its art direction, cinematography,and visual effects.

VOA: standard.2010.03.08

At the White House, Press Secretary Robert Gibbs said the threatened North Korea moves were "a serious step in the wrong direction" and urged Pyongyang to end what he termed its "provocative threats" and live up to its international obligations.

VOA: standard.2009.04.14

Ileana Ros Lehtinen is the ranking committee Republican "It should be clear that unless we impose the maximum pressure on Iran, and this bill is a major step forward in that direction, the regime will continue its march toward acquiring nuclear weapons, dominating the Persian Gulf, and expanding its network of radical militants around the world,".

VOA: standard.2009.10.28

"There is a perception that President Obama brings with him a sensibility and sensitivity to the region and I think that will stand him in very good stead because there is already a very strong expectation that President Obama will set a new direction for US policy towards its partners, towards APEC, and in particular towards Asia."

VOA: standard.2009.11.08