Four bright celestial beacons and a faint triangle of light follow the plane of the ecliptic as it arcs high through this southern hemisphere night skyscape.
四个明亮的天体和一个模糊的三角形光带沿着黄道平面弧形伸展在这南半球的夜空。
Let's start with a triangle in the plane Well, then we need two vectors to describe it say A and B here. How do we find the area of a triangle?
平面上有一个三角形,用两个向量描述,记作A、B，怎样求三角形的面积？
Often a Triangle writer had noted a ship or plane had disappeared in "calms seas" when the record showed a raging storm had been in progress.
每当有记录一场狂风暴雨将要来临的时候，追踪百慕大三角现象的作家便常常能记录到有船只或者飞机会在“平静的海域”消失。
Prove some inequalities involving a moving-point on the plane of triangle with it′s distance coordinates.
利用三角形的重心坐标，证明涉及三角形平面上一动点的一些不等式。
A triangle is a plane figure with three sides.
三角形是有三个边的平面图形。
A triangle is a plane figure with three sides.
三角形是有三个边的平面图形。
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