示踪线：也有人称之为烟线，界说是所有经由过统一位置的流体质点，在某一时刻下形成的连线
。若是我们在流场中某个点，一直的释放不思量质量的烟雾或者墨水，那么这些在统一位置点冒出的烟雾和墨水在某一时刻时形成的线，就叫做示踪线
。

Tracer line: also known as smoke line, defined as the line formed by all fluid particles passing through the same location at a certain moment. If we continuously release smoke or ink that does not consider mass at a certain point in the flow field, then the line formed by the smoke and ink emitted at the same point at a certain moment is called a tracer line.

　　流线：沿着流场质点速率矢量相切的偏向形成的连线
。以是流线上恣意一点切线的偏向，就代表了外地流体质点的速率偏向
。流线的希罕的地方，流场速率小，流线麋集的地方，流场的速率大
。并且，每一条流线上的速率和压力的关系，都知足伯努利方程
。 凭证界说，我们可得知，流场内恣意两条流线都不会相交，由于统一个流体质点不可能同时具有两个差别的运动偏向
。记得读流体力学书时，为了加深对流线的明确，先生告诉我们：每一条流线，都可以看作一堵可以自由滑移的壁面，流体可以贴着壁面流动、而不会穿过
；这样诠释流线，形象而生动
。

Streamline: a line formed along the direction of tangent to the velocity vector of a particle in the flow field. So the direction of the tangent at any point on the streamline represents the velocity direction of the local fluid particles. In areas with sparse streamlines, the velocity of the flow field is low, while in areas with dense streamlines, the velocity of the flow field is high. Moreover, the relationship between velocity and pressure on each streamline satisfies the Bernoulli equation. According to the definition, we can know that no two streamlines in the flow field will intersect, because the same fluid particle cannot have two different directions of motion at the same time. Remember when reading a book on fluid mechanics, in order to deepen our understanding of streamline, the teacher told us that each streamline can be seen as a wall that can slide freely, and fluid can flow against the wall without passing through it; Explaining the streamline in this way is vivid and vivid.

　　凭证流线的界说，我们又可以衍生出流管，想象流线若是起始于流场内一个关闭的环，在流线向后一直生长历程中，又会有新的关闭的环爆发，这些环组成的面，就称作流管
。同样的，流管也像壁面一样，把管内和管外的流体支解开来，而不会穿透
。

According to the definition of streamline, we can also derive a flow tube. Imagine if the streamline starts from a closed loop in the flow field, and as the streamline continues to develop backwards, new closed loops will emerge. The surface formed by these loops is called a flow tube. Similarly, flow pipes act like walls, separating the fluid inside and outside the pipe without penetrating.

　　迹线：流体质点空间位置在时间历程上形成的轨迹
。以是迹线现实上形貌的是流场信息在一个时间段内的效果
。它纪录了差别时刻下跟踪质点空间位置的转变
。

Trace: The trajectory formed by the spatial position of fluid particles over time. So the trace actually describes the result of flow field information over a period of time. It records the changes in the spatial position of tracked particles at different times.

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