But blood drops with long tails can tell a great deal about the direction, speed and angle of the blood's starting point.

VOA: special.2010.05.05

A magnitude is how long this guy is and direction is at what angle it is.

大小是指它的长度,而方向是指它与坐标轴的夹角

耶鲁公开课 - 基础物理课程节选

Haze drove on, leaving the man who has helped him: "The blinding white cloud had turned into a bird with long, thin wings and was disappearing in the opposite direction."

海斯继续开车，离开了那位帮助他的男人：,那朵亮白的云转变成了一只有这长而瘦的羽翼的小鸟的形状,消失在另一个方向“

耶鲁公开课 - 1945年后的美国小说课程节选