福克斯新闻 五名美军士兵在阿富汗丧生

The five Americans, described as Special Operations forces, were taking part in a security operation when they came into contact with the Taliban in the south of the country. After calling in air support, it's believed they were hit mistakenly by the B-1 bomber¹ that had come to help.

Under current operational constraints² put in place by outgoing Afghan President Hamid Karazi – air strikes like this are only called in when troops fear they're about to be killed.

Emily Wither³, FOX News Radio.

1 bomber   

n.轰炸机，投弹手，投掷炸弹者

参考例句：

• He flew a bomber during the war.他在战时驾驶轰炸机。
• Detectives hunting the London bombers will be keen to interview him.追查伦敦爆炸案凶犯的侦探们急于对他进行讯问。

2 constraints   

强制( constraint的名词复数 )； 限制； 约束

参考例句：

• Data and constraints can easily be changed to test theories. 信息库中的数据和限制条件可以轻易地改变以检验假设。 来自英汉非文学 - 科学史
• What are the constraints that each of these imply for any design? 这每种产品的要求和约束对于设计意味着什么？ 来自About Face 3交互设计精髓

3 wither   

vt.使凋谢，使衰退，(用眼神气势等)使畏缩；vi.枯萎，衰退，消亡

参考例句：

• She grows as a flower does-she will wither without sun.她象鲜花一样成长--没有太阳就会凋谢。
• In autumn the leaves wither and fall off the trees.秋天，树叶枯萎并从树上落下来。