清算所得稅:VB 代码解释，明天急用

Dim Snow(1000, 2), Amounty As Integer

Private Sub Form_Load()
Form1.Show
DoEvents
Randomize: Amounty = 325
For J = 1 To Amounty
Snow(J, 0) = Int(Rnd * Form1.Width)
Snow(J, 1) = Int(Rnd * Form1.Height)
Snow(J, 2) = 10 + (Rnd * 20)
Next J

Do While Not (DoEvents = 0)
For LS = 1 To 10
For I = 1 To Amounty
OldX = Snow(I, 0): OldY = Snow(I, 1): Snow(I, 1) = Snow(I, 1) + Snow(I, 2)
If Snow(I, 1) > Form1.Height Then Snow(I, 1) = 0: Snow(I, 2) = 5 + (Rnd * 30): Snow(I, 0) = Int(Rnd * Form1.Width): OldX = 0: OldY = 0
Coloury = 8 * (Snow(I, 2) - 10): Coloury = 60 + Coloury: PSet (OldX, OldY), QBColor(0): PSet (Snow(I, 0), Snow(I, 1)), RGB(Coloury, Coloury, Coloury)
Next I
Next LS

Loop
End

上面是整个VB程序……

下面 这些 请详细 解释 谢谢。请在今晚 告诉我。谢谢，急用。
DoEvents
Randomize: Amounty = 325
For J = 1 To Amounty
Snow(J, 0) = Int(Rnd * Form1.Width)
Snow(J, 1) = Int(Rnd * Form1.Height)
Snow(J, 2) = 10 + (Rnd * 20)
Next J

Do While Not (DoEvents = 0)
For LS = 1 To 10
For I = 1 To Amounty
OldX = Snow(I, 0): OldY = Snow(I, 1): Snow(I, 1) = Snow(I, 1) + Snow(I, 2)
If Snow(I, 1) > Form1.Height Then Snow(I, 1) = 0: Snow(I, 2) = 5 + (Rnd * 30): Snow(I, 0) = Int(Rnd * Form1.Width): OldX = 0: OldY = 0
Coloury = 8 * (Snow(I, 2) - 10): Coloury = 60 + Coloury: PSet (OldX, OldY), QBColor(0): PSet (Snow(I, 0), Snow(I, 1)), RGB(Coloury, Coloury, Coloury)

请详细到每一句