Finally, is knocking harmful? Occasional light knocking will not harm your engine.

最后，在敲门有害？偶尔敲门，这将不会伤害你光引擎。

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Instead of the occasional light pulse, this new laser has the occasional dark pulse, which lasts about one nanosecond.

这种新的激光器是产生长约1纳秒的暗脉冲，而不是光亮的脉冲。

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Day, and friends, play up the mountain road in a cluster of wild flowers and occasional light purple petals dance in the wind, giving a hazy beauty.

一日，和朋友上山游玩，路中偶遇一丛野花，淡紫色的花瓣在风中起舞，给人一种朦胧之美。

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It added that there should only be occasional light snow flurries from Saturday morning.

BBC: Snow in Coventry

Temperatures are expected to remain low across Wales over the Easter weekend but it will be mostly dry with the occasional light wintry shower.

BBC: Wales weather: Major roads all reopen following snow

His "penny-pinching tips, " for example, encourage readers to make late-day visits to bakeries for free carbs and bring backpacks to friends' places to nab an occasional light bulb.

CNN: Online relief for the recession-weary