This report described an Apache helicopter firing warning shots after coming under fire. Its reaction was described as “an escalation of force.”

该报告中描述了一架阿帕奇直升机在遭遇攻击后发射警示弹，而它的反应被形容为“火力升级”。

youdao

Objective: To investigate the effect of shoe heel height on the ground reaction force and the center of sole force.

目的：通过研究女性行走时地面反力和鞋底压力中心，探讨鞋跟高度对地面反力和鞋底压力中心的影响。

youdao

If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.

如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。

youdao

In theory, such flare-ups should offer the European Union a chance to show some military mettle for all its talk of having a rapid-reaction force of its own, but in practice the Macedonian crisis comes when Europeans are still wholly unready for reaction.

ECONOMIST: Pulling together, or pulling apart?

European leaders are set to take a vital step towards the creation of a Rapid Reaction Force of up to 60, 000 personnel.

CNN: Europe bites bullet with defence force

It is also implementing a radical reform of its command structure and forces, the key to which will be the creation of a new Nato reaction force of 15-20, 000 personnel, designed to react in days rather than weeks or months to crises around the world.

BBC: NEWS | Americas | Nato studies future tasks