Most informatory signs are rectangular but signs giving route directions at a junction usually have one end pointed .

大部分指示标志都是长方形，但在路口指示路的方向标志，通常一边为箭尖形。

Warning signs and informatory signs will help to guide you through the road works area or divert you around the obstruction .

路上会设有警告标志和提示性标志，指引驾驶人驶出道路工程范围，或绕过障碍物。

The positive fact is an aggregate that includes some elements about the affairs composed , an informatory point in the fourth-dimension while the negative fact is an empty aggregate that includes nothing , a supplementary aggregate of any positive fact .

积极事实是一个包含事实构成要素的集合，在四维时空坐标中对应的是一个确切的点；而消极事实是一个不包含任何元素的空集，是任何一个积极事实的补集。