We had to explain why it had happened, figure out some way to improve our forecast of such storms in future (with appropriate expressions of uncertainty). (judithcurry.com)
And substitution is the exchange of appropriate expressions for variables. (religion-online.org)
Non-fluent readers suffer in at least one of these aspects of reading: they make many mistakes, they read slowly, or they don't read with appropriate expression and phrasing. (readnaturally.com)