标题：Polaris Dawn’s First Private Space Walk Was a Stellar Success

正文：It wasn’t a small step—more a clamber, really—but as billionaire entrepreneur Jared Isaacman climbed partway out of a SpaceX Dragon capsule located nearly 740 kilometers above Earth on early Thursday morning, he made a giant leap into spaceflight history. Polaris Dawn had already marked its first historic milestone mere hours after launch when it fired Dragon’s thrusters to raise the spacecraft’s swooping elliptical orbit and reached more than 1,400 kilometers in altitude at its peak. That’s the farthest from Earth any human has ventured since the 1970s, when the last of the Apollo lunar missions left the entire planet in the rearview on the way to the moon.

知识点：clamber n.

a difficult climb or movement of this sort 艰难的攀爬

a clamber up the cliff path.一次沿着悬崖小道艰难的往上爬行。

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