But he explained that a spacecraft's orbit lifetime could only be estimated to about 10% accuracy.

但他解释说，航天器的轨道寿命只能估测出约10%的准确度。

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This method is very powerful especially for problems concerning space debris mitigation that require a large amount of calculation of the satellite orbit lifetime.

在诸如空间碎片减缓这种需要非常大量的计算卫星寿命的问题中，新方法的价值得到充分体现。

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This paper describes a way to modify bearing preload in - orbit, which can provided hard preload for launch and soft preload in flight to achieve long lifetime of rolling bearing.

提出一种可在轨调节航天轴承预紧力的方法，可同时满足发射时高预紧力和在轨工作时低预紧力的要求，可有效提高轴承在轨工作寿命。

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But he explained that a spacecraft's orbit lifetime could only be estimated to about 10% accuracy.

BBC: Nasa refines satellite crash time

The current ICESat has been in orbit since 2003 and is nearing the end of its lifetime.

CNN: NASA flights will study Antarctic ice changes