火箭推进器

戴维卡梅伦（davidcameron）上周称，他希望在社会福利体系下面装上“火箭推进器”，在我听来这可不是什么好计划。

David Cameron last week said that he wanted to put " rocket boosters " under the welfare system , which sounds like a poor scheme to me .

就在上月，SpaceX曾首次成功将一枚火箭推进器在地面着陆，但事实证明，海上着陆更具挑战性。

Although SpaceX had its first successful landing of a reusable booster on land just last month , sea landings have proven to be more challenging .

然而，火箭推进器的返回却不那么成功。

However the return of the booster was less successful .

热声耦合的本质是空间中热能与声能相互转化的现象，目前，国内外热声领域的研究主要集中在热声制冷，火箭推进器等方向。

The essence of thermoacoustic is a phenomenon of reciprocal transformation of thermal energy and acoustic energy in medium . At the present time , both in China and other countries , the thermoacoustic field concentrates its attention on thermoacoustic refrigeration and rocket propellers .

火箭发动机比其他推进器有许多优点。

Rocket motors have many advantages over other forms of propulsion .

艾伦氠斯科（ElonMusk）旗下的SpaceX一直关注于在火箭发射后在地球上回收火箭推进器的技术，希望能够通过火箭再利用令该公司降低成本。

Elon Musk 's SpaceX has been focused on mastering the art of returning booster rockets on Earth after a launch , in the hope this will enable the company to lower costs by re-using these rockets .

总部位于旧金山的火箭公司SpaceX上周日宣布成功发射一颗卫星，但未能在海上成功回收火箭推进器，没有完成该公司多次未能完成的目标。

SpaceX announced a successful satellite launch on Sunday - but failed an attempted sea-landing of a rocket booster , missing a goal that has repeatedly eluded the grasp of the Los Angeles-based rocket company .