They no longer talked about the substance of the mission.

Carbon is just about the most common substance on earth.

Others aren't so sure about the substance behind his flash.

"I learned a lot about the substance of the process - much more so than if we had just studied it in a book."

There is another point I would like to make about the substance of the proposal.

Neither side made a statement about the substance of yesterday's meeting.

The company gave no details about the substance of the discussions.

After all, we are talking here about substances that pose a risk not only to the environment, but also to public health.

Nothing has appeared in the Chinese press about the substance of the discussions so far.

The participants refused to talk about the substance of their meetings.