Gear tooth face serious wear new gear should be changed, if only gear at both ends of the plane wear, can be in surface grinding machine on grinding repair light.

齿轮齿面严重磨损时应更换新齿轮，如果只是齿轮的两端平面磨损，可在平面磨床上磨削修光。

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Your body needs to experience all three steps of sleep—light sleep, dream, and deep sleep—to fully repair itself.

你的身体需要经历睡眠的三个步骤——浅睡眠、做梦和深睡眠——从而进行完全的自我修复。

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They received a shot of genes near their retinal cells to repair their light receptors.

他们接受了视网膜细胞附近的基因注射，以帮助修补他们的光受体。

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Both carriageways of the road were reopened by 15:00 BST on Saturday after work took place to repair power lines hit by the light aircraft.

BBC: A1 in Cambridgeshire reopens after fatal plane crash

The ceiling is shoulder height, and you are trying to repair a piece of heavy machinery by the light of a small torch.

ECONOMIST: Ukraine

The governor there dispatched the National Guard to assist rescue efforts, and Connecticut Light and Power had begun dispatching crews to repair the electrical grid now that winds had subsided.

FORBES: Overnight Sandy Roundup: East Coast Reeling As Hurricane Leaves 6 Million Without Power