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We would be able to sense it as a heat source.

Just one year earlier, however, someone had discovered a potential source of heat.

But he said scientists do not know how important this source of heat is.

It is sometimes used as a heat source during power failures.

Originally, natural gas was used as a heat source in the late 19th century.

Underneath is a heat source, often built into the table itself.

A fire can start from any small spark or heat source.

There was a heat source above them, to their left, on a pole.

There was definitely a heat source, but it could have been a house by its size.

Before we can do anything else, sir, in your plan or mine, some sources of light and heat have to be found.

We would be able to sense it as a heat source.

Just one year earlier, however, someone had discovered a potential source of heat.

But he said scientists do not know how important this source of heat is.

It is sometimes used as a heat source during power failures.

Originally, natural gas was used as a heat source in the late 19th century.

Underneath is a heat source, often built into the table itself.

A fire can start from any small spark or heat source.

There was a heat source above them, to their left, on a pole.

There was definitely a heat source, but it could have been a house by its size.

Before we can do anything else, sir, in your plan or mine, some sources of light and heat have to be found.