[00:00.000] 作词 : Macfadden
[00:00.00]Lesson 6:The Lecture -Jurassic 5
[00:01.138]OK let's begin
[00:04.638]Compound:A substance composed of two or more elements chemically combined in definite proportions by weight
[00:10.898]Mixture:Two or more substances that are not chemically united such as air
[00:15.78]Solution:A uniform mixture of varying proportions of a solvent and a solute
[00:24.908]For many of our students this is the lesson you've been waiting for
[00:28.648]Lesson Six
[00:38.18]Left channel
[00:41.638]Right channel
[00:45.758]Hydrogen H 1
[00:47.938]Sodium Na 1
[00:49.878]Magnesium Mg 2
[00:52.368]Aluminum Al 3
[00:54.298]Potassium K 1
[00:56.488]Calcium Ca 2
[00:58.668]Chromium Cr 2three six
[01:29.428]Any physical difficulty with a record or a turntable is taken care of
[01:44.288]Do you think that Led Zeppelin and Frank Sinatra would go together
[01:48.788]No
[01:50.598]Combinations of music
[02:08.318]You're about to play a sole 45RPM recording
[02:11.998]But the turntable is set at 33and 1/3
[02:14.688]And the record plays very slowly
[02:23.478]Let's pick up the tempo a bit eh
[02:37.858]Now let us imagine you are in the middle of your Disk Jockey program
[02:48.858]This is the mark of a professional
[02:59.778]Yeah if you could throw a couple   yeah uhuh
[03:02.468]Right when he's playin'the drum
[03:03.538]Let him play a couple'beats alone
[03:05.468]Eeeeuuh
[03:16.18]Uh
[03:46.48]Oh I'm sorry I had the turntable at the wrong speed
[04:13.270]Listen
[04:18.770]Scratching --The greatest thing on earth
[04:31.288]What do you do
[04:33.198]What do you do
[04:46.348]Drop
[04:56.708]Chemical change:a change that alters the composition of the