Unity particle Foundation

Add this component

Duration That is to say How many seconds later The particles don't spray Set to 1 Namely 1 No particles will be emitted in seconds
Looping Whether to circulate Check it and you can launch indefinitely
Prewarm preheating When you start the cycle , Preheating is effective , The amount of particles is equivalent to a period of emission
Start Lifetime The particles disappear after a few seconds
Start Speed The speed at which particles are emitted
Gravity Modifier gravity The greater the numerical The faster the particles fall

Simulation Space

If it is Local So your object moves The particles follow
If it is World that Objects don't follow This is needed for tailing

These two can be set together You can also set only one
Rate over Time If you want particles to emit forever It has nothing to do with moving Then fill in this He will launch every second
Rate over Distance If you wish The particle Spray only when moving If the movement stops, it won't spray Then the one above says 0 Use this now It depends on your choice

Can control the size of ions in the life cycle
Nothing to say
The only thing to notice is

Specific adjustments can be seen in the following You have to click the drop-down menu
Or you won't see that curve

This determines the shape of the launch

For example, it can be like this
https://docs.unity3d.com/cn/2022.1/Manual/class-ParticleSystem.html