Two rockets homed in on it from behind without a sound.

两枚火箭无声地从后面向目标射去。

《柯林斯英汉双解大词典》

As soon as it was activated, the ejection sequence activated two rockets attached to the back of his chair.

它一旦启动，发射程序将点燃两个绑在他座椅后面的两个火箭。

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Plans call for the construction of a new crew capsule called Orion to replace the space shuttle in 2015, plus two rockets and a lunar lander.

计划需要在2015年建设一艘名为“猎户星”号的新太空船来取代现在的航天飞机，加上两枚火箭和一辆月球登陆车。

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At least two rockets fired from Lebanon crashed into northern Israel, breaking a calm along the border that has prevailed since January.

VOA: standard.2009.09.11

It needed much more power than the rockets used to launch the one-man Mercury and the two-man Gemini flights.

VOA: special.2009.07.08

NASA is developing two separate rockets for the Ares program.

VOA: special.2009.12.30

Two rockets were fired during President Barack Obama's visit to Israel two weeks ago.

NPR: Israel Says It Will Not Let Gaza Rockets Continue

In that incident, two rockets fired from the Egyptian Sinai by Gaza-based militants landed in open areas, without causing damage or injury.

BBC: Gaza city: Israeli air strike kills Palestinian militant

As Obama began his program Thursday, Israeli police said militants in Gaza had fired two rockets at the southern town of Sderot.

NPR: Rockets Hit Israel As Obama Meets Palestinians