外展隙

The embrasures are between 14 and 30 inches in height and are usually recessed. 槍炮眼通常高14到30英寸，而且通常凹進(jìn)掩體壁。

Jiaqing cannon with Ruyi knot,not renovated yet,with inscriptions up and down.It has embrasures up and down,wonder which side is up. 有如意結(jié)的嘉慶炮，沒(méi)清理，上下都有銘文，而且上下都有點(diǎn)火的炮眼，都不知道那面在上，那面在下。

Deep embrasures as well as the sculptural effect of the building mass create a vivid picture of light and shadows but without distraction from the overall form. 建筑體凹凸有致,具有雕塑性造型,經(jīng)由外立面的光影效果,形成生動(dòng)活潑的畫面,并不與整體效果沖突。

When the facial embrasures are opened, it is possible to increase the area of light deflection (shadows) and to reduce virtually the tooth smooth surface width (area of light reflection). 唇側(cè)外展隙打開(kāi)的時(shí)候，此處光線偏轉(zhuǎn)區(qū)面積（陰影區(qū)）增加，使視覺(jué)上牙齒唇平面寬度（反光區(qū)）減小。

protected with battlements or parapets with indentations or embrasures for shooting through. 用鋸齒狀的和有可以射擊的槍眼的城垛、胸墻保護(hù)。