After undocking the astronauts will fly around the station one final time before returning to earth wednesday morning .
启程后，宇航员在星期三早晨返回地球前最后一次围绕太空站飞行。
Russia says its progress unmanned cargo spacecraft will begin scientific experiments friday after undocking from the international space station .
俄罗斯表现，俄罗斯“提高号”无人驾驶货运飞船与国际空间站分别后，将于礼拜五开端进行迷信实验。
A second undocking attempt ' could have gone ahead today , but we need additional time to make sure we have reliable information about the problem , ' perminov said .
