One hundred hours and 12 minutes into the mission, the command/service module Columbia releases the lunar module Eagle for its descent to the Sea of Tranquility.

登月任务进行100小时12分钟后，指挥/服务舱哥伦比亚号（Columbia）释放登月舱鹰号（Eagle），让它下降到月面的静海区域（Sea of Tranquility）。

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The lunar module begins a slanting descent to the moon's surface.

登月舱开始倾斜着向月球表面降落。

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The lunar module began a slanting descent to the moon's surface.

登月舱开始向月球表面倾斜降落。

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Vasily Moroz from the Russian Space Research Centre said the two sides had considered using a US-built probe with a Russian booster rocket and descent module, but that the project was drawn to a halt by funding issues.

BBC: Mars rover (Nasa)

Europe is keen to have a go at touching down on Mars and the current baseline design for the orbiter mission calls for a 600kg entry, descent and landing module.

BBC: Esa-Nasa Mars missions' race against clock

After an explosion in Apollo 13's service module cut off propulsion and power, the lunar excursion module (LEM) was used as a lifeboat to provide life support to the three astronauts, and the engine of its descent stage for course changes, until the command module could re-enter the atmosphere after a long coast around the moon.

MSN: Salvaging Science from Stricken Mars Moon Probe: A Scientist's View - Technology & science - Space - Space.com | NBC News