Open sight 开放式照门 ; 瞄准器 ; [军] 缺口表尺 ; 砚孔
It was a pretty sight, and a seasonable one, that met their eyes when they flung the door open.
当他们猛地把门打开时，眼前出现了一幅美丽的、合乎时宜的景象。
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She started a little at the sight of the open window.
她看到开着的窗户，吓了一跳。
You always request us to open L/C at sight.
你方一直要求我们开立即期信用证。
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