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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Despite enjoying the odd tipple of whisky and sherry, Doug swore he'd never been inside a pub in his life and never bought liquor "in any shape or form" apart from the occasional light beer .

尽管有时也享受一下威士忌和雪利酒这些烈性“饮料”，但道发誓说他这辈子从没有进过酒馆，也从没买过“任何种类的”酒，除了偶尔喝一点儿低度啤酒（黄啤酒）。

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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