如何在Corona中在物体进入屏幕之前同时暂停物理对象？

我使用了 physics.pause() 和 physics.start() ，它们能工作，但我的问题是一个函数一直在底部显示一个对象，并且当我恢复游戏时，这些对象被编译并一起进入屏幕。希望有人能帮帮我。

这是我的代码：

local isPaused = false

function pausePhysics( event )
 if "began" == event.phase then
 if isPaused == false then
 physics.pause(lobo)
 isPaused = true
 timer.pause(countDownTimer)

local decide = display.newImage("wood.png")
 decide.x = display.contentWidth*0.5
 decide.y = display.contentHeight*0.5
local yes
local no

local function oo()
 if score == 0 then
 onBackBtnRelease()
 elseif score >0 and score <=10 then
 GameOver1()
 elseif score >10 and score <=20 then
 GameOver2()
 else
 GameOver3()
 end
end

yes = widget.newButton
 {
 defaultFile= "yes.png",
 width=100, height=50,
 onRelease = oo
 }
 yes.x = display.contentWidth*0.3
 yes.y = display.contentHeight - 200

local function hindi()
 if isPaused == true then
 physics.start()
 isPaused = false
 timer.resume(countDownTimer)

 display.remove(decide)
 decide = nil
 display.remove(yes)
 yes = nil
 display.remove(no)
 no = nil
 end
 return true
end

no = widget.newButton
 {
 defaultFile= "no.png",
 width=100, height=50,
 onRelease = hindi
 }
 no.x = display.contentWidth*0.7
 no.y = display.contentHeight - 200

sceneGroup:insert(decide)
 sceneGroup:insert(yes)
 sceneGroup:insert(no)
 return true
 end
 end
end

local function tapos(event)
 if (event.phase == "began") then
 physics.addBody(backBtn, "static")

 end
end
Runtime:addEventListener("enterFrame", backBtn)
backBtn:addEventListener("touch", pausePhysics)

local function ulit()
local mRandom = math.random
local balloon = { ("blue.png"), ("green.png"), ("red.png"), ("orange.png"), ("pink.png"), ("violet.png"), ("yellow.png"), ("blue2.png"), ("green2.png"), ("red2.png"), ("orange2.png"), ("pink2.png"), ("violet2.png"), ("yellow2.png") }
local lobo = display.newImage( balloon[mRandom(10)], mRandom(30,270), mRandom(550,650) )
physics.addBody( lobo, { density=0.1, friction=2.0, bounce=0.0, velocity=-40, isSensor=true } );

end
timer.performWithDelay(300,ulit,0)