在牢固的基础上

keep a firm grasp on keep a firm hand on on an equal footing obtain a footing get a footing gain a footing on firm ground on the same footing with on an equal footing with keep a firm hand with a firm hand compete on an equal footing as firm as a rock trade name of a firm footing lump sum on firm bill quantities take a firm hold of sth have a firm hold over sb accordance with the principle of consultation on an equal footing