We have been in quarantine probably longer than any other space crew has ever been in the history of the space program.

我们被隔离的时间可能比任何其他太空工作人员都要长在太空计划的历史上。

Space crews generally need to exercise at least 15 hours a week to slow down the process of bone degradation, but even that can't fully stave loss of bone density.

宇航员通常需要每周至少锻炼 15 个小时来减缓骨骼退化的过程，但即使这样也不能完全避免骨密度的损失。