为什么此变量在gdscript中不断更改为false？

Question

我正在尝试使此脚本保持稳定。当玩家跳跃时，应该让其开始并开始移动而不停止。但是，只有当玩家跳跃时它才会移动。

我的代码：

extends Area2D

#Script-Purpose: move and delete ground

#Ground moving speed
const SPEED = -150

#a vector2 to change the speed of the ground
var velocity = Vector2()

#to check if you have jumped yet
var Jumped=false

#calls Physics
func _physics_process(delta):

        #left-click=jump
    if Input.is_action_pressed("ui_jump"):
        Jumped=true

    #make the velocity.x equal to speed accounted with delta time
    if Jumped==true:
        print(Jumped)
        velocity.x = SPEED * delta
        translate(velocity)
    else:
                #this is here so I can check if the Jumped var is false
        print(Jumped)

跳跃的时间一半是错误的，另一半是真实的。