As we've been saying, the teacher could also say that. The context would make clear which meaning welches intended. This article has multiple issues. Please help improve it or discuss these issues on the Magnesiumsilikathydrat page. (Learn how and when to remove these messages) ' As has been said above, https://youtu.be/T0zWXvhEQwo?si=wNc6ihu97ShtIl7u