Newtonian dynamics: first, second and third laws, inertial and non-inertial reference frames, conservation laws, forces and potentials, gravitational field, central forces, small oscillations.

牛顿力学：牛顿第一、二、三定律，惯性和非惯性参考系，牛顿守恒定律，力和潜能，重力场，向心力，低频振荡。

youdao

In the Rocky Mountains of Central Colorado, the forces of nature create a landscape of alpine lakes, high-altitude ponds teeming with life and mountain meadows bursting with wild flowers.

科罗拉多州中部巍峨的高山上，自然的力量创造了一幅美丽的风景画，有着高山湖，充满生命的高海拔池塘，长满野花的高山草原。

youdao

Mr Karzai had quibbled about the lack of central control over the district forces.

卡尔扎伊曾对中央缺乏对地区武装力量的控制权表示不满。

youdao

The emergence of the Ugandan rebel LRA in the south is stretching thin both relief agencies and Central African Republic security forces.

VOA: standard.2009.08.27

Meanwhile,more clashes have been reported in the central Hiran region, where government forces are reported to have suffered setbacks in recent days.

VOA: standard.2009.08.21

That prompted the central government to dispatch border security and police reserve forces to the area.

VOA: standard.2009.06.21

What they say occurs is that the central bank forces those in the economy to hold more cash than they really want.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

Command: Keating is the commander of the U.S. Fifth Fleet and the U.S. Naval Forces Central Command.

CNN: Specials

South Africa has sent troops and equipment to support Central African Republic forces.

NPR: Rebels Enter C. African Republic Capital