That adjustable focus allows astronauts to perform tasks like reading small-print checklists in low-light conditions on minute, then monitoring overhead readouts the next using the same pair of specs.
这种可调节的焦点使得宇航员能够执行诸如在一段时间内在昏暗光线下阅读小字清单的任务，然后用相同规格的一对镜片监测日常开销读数。
The reading button can turn on your overhead light.
这个按钮用来开亮您头顶上方的灯。
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