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The roof has heat insulation underneath !!!
Derek Why is there snow on the roof of that house but not on the others ? They were all covered when it started snowing, but not now it's stopped.
Vernon Well, just think a bit.
Derek Well I suppose the temperature of the roof with snow on must be colder.
Vernon Exactly. So the temperature on the roofs of the others must be warm enough to melt the snow.
Derek I suppose that's right. So assuming the house with snow on the roof is heated, which I know it is, something must be preventing the heat escaping through the roof.
Vernon Dead right. And that's because the roof has heat insulation underneath, probably some kind of plastic foam.
Derek So the roofs of the other houses can't be insulated. Their heating bills must be a lot higher then.
Explanation :
Insulation - A material that reduces or prevents the transmission of heat or sound or electricity
Example : In the West, many houses are insulated against heat loss with insulation materials.

On the verge of

Fill me in on the task

I am through working overtime

The numbers didn't add up

Give me the rundown

Cut-throat competition

See the work through

It is feasible

This item is sought-after

Sells like hot cakes

Look it up

Got it all planned out

I've lucked out

Speak your minds

On top of that

We spread out the news

He's all tied up

Keep an eye on

Stuck in traffic

Pricing and samples

Time is ticking away

We talked on the phone

I need to think it over

She's driving a hard bargain

Long-standing support

Production lead time

In no time

Expedite the payment

Defective goods

Work wonders

Get in contact with

You're making me blush

Keep you updated

Filled him in

I'll see to it

Grab a bite

The bottom line is quality

They are high-tech items

Our lead time is 14 days

Fit in with

Have a word with you

I am flattered by your praise

Well begun is half done

I am just a workaholic

Give me a hand

You reap what you sow

Keep track of

It's my treat

A tight schedule

Have a second thought

I've made up my mind

Fire away

It's no bother at all

With flying colors


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