It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是我们所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是我们所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而方法——也就是我们所说“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶实的方法——也就是我们所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是我们所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而方法——也就是我们所说“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是我们所说的“化”——就是要磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是我们所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。

It is common knowledge now that the way to make rubber hard and strong -- to "vulcanize" it, as we say -- is by heating it with sulphur.

要使橡胶硬而结实的方法——也就是所说的“硫化”——就是要掺入硫磺加热，这一点现在已是常识了。