... 半进流角 half angle of entrance 尖进流段 lean bow; sharp entrance 减速进流 retarded inflow ...
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The sharp variation of luminance at the entrance and exit of highway tunnel will cause the difficulty in visual adaptation of the driver, and even lead to traffic accidents.
公路隧道进出口亮度的急剧变化会造成驾驶员视觉适应困难，严重时甚至导致交通事故。
Sharp fringes are visible except near the point of entrance .
除了在入射点附近以外，均可看到清晰的条纹。
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