In the afternoon a second strike was flown off.

下午又飞出第二批轰炸机群。

China needs to be certain of having a nuclear second strike.

中国需明确无疑地拥有二次核打击能力。

The submarine is China's first step to build a sea-based nuclear force, which can provide the country with the valuable 'second strike' capability.

潜艇是中国建立海-建核力量的第一个步骤，能提供国家拥有宝贵的‘第二次打击’能力。

Target destructive estimation is an import component of C3I system and a main criterion in command decision whether carries out the second strike for target.

目标毁伤评判是C3I系统的一个重要组成部分，在指挥决策中它是决定是否对目标实施第二次打击的主要判据。

A message sent at 9.04am said that the fuselage of the first plane at the north tower had caused a second explosion - misinterpreting the second strike at the south tower.

上午9：04，一条发出的信息称，撞上北塔的飞机机身导致了引起了第二次爆炸——其实第二次是撞在了南塔上。