The explanation has a sound historical foundation.

Russell was ultimately concerned with establishing sound epistemological foundations.

The act has been amended or added to many times since but continues to be sound foundation for determining and administering water rights.

On the other hand, Guangzhou has become a city with a sound industrial foundation and developed tertiary-industry.

This was not because it was based on a sound theoretical foundation: many of the practices of the Law made no logical sense.

The deal put WayForward on a very sound financial foundation.

We need clarity, built on sound scientific foundations, if we are to take the right action.

Long-term growth must be based on a sound macro-economic foundation.

The proposals that have been made are a step in the right direction, and if they are acted upon, lay sound foundations for the future.

If you form a very sound foundation there, and things don't go well on the field, you don't fall so low.