SpaceX刚刚发布了一段引人注目的视频，视频显示其商业太空的士“龙”(Dragon)机组人员正在接受紧急中止系统的严格测试。
The idea is that if something goes wrong with the rocket carrying the Crew Dragon to orbit, the module can engage its own thrusters to quickly escape the danger - and then coast down safely on a parachute.
他们的想法是，如果搭载乘员龙号进入轨道的火箭出了什么问题，该模块可以使用自己的推进器快速脱离危险，然后依靠降落伞安全着陆。
The spacecraft is outfitted with eight SuperDraco engines, allowing it to cover half a mile in just 7.5 seconds during an emergency, reaching a top speed of 436 mph (700 km/h), according to a follow-up tweet.
据后续推特消息，该飞船配备了8台Superdraco发动机，在紧急情况下，仅需7.5秒就可以覆盖半英里，最高时速达到436英里(700公里/小时)。
Parachutes ensure that the craft safely lands back on Earth after the system deploys.
降落伞确保飞船在系统部署后安全着陆。
But testing hasn't always gone according to plan. The same engines were responsible for blowing up the first Crew Dragon capsule during a system test in April.
但测试并不总是按计划进行。在今年4月的一次系统测试中，同样的引擎也炸毁了第一艘乘员龙号太空舱。
Last week, SpaceX tested the first stage of its Falcon 9 boosters that will be responsible for launching two NASA astronauts into orbit as part of Crew Dragon's first-ever crewed test flight. When exactly that test flight will take place is still uncertain.
上周，spacex测试了其falcon 9助推器的第一阶段，该助推器将负责将两名NASA宇航员送入轨道，这是“龙”号首次载人试飞的一部分。具体何时进行试飞仍不确定。
