to express worry or doubt about an issue
expresar preocupación o duda sobre un tema (expresar preocupacion o duda sobre un tema)
"Activists raised concern about the pollution levels in the river."
"Los activistas expresaron preocupación sobre los niveles de contaminación en el río." (Los activistas expresaron preocupacion sobre los niveles de contaminacion en el rio.)
to focus your mind on staying calm
to emphasize something; to make something more noticeable
to behave in a confident and graceful way
to say exactly what one thinks or feels
to catch an illness, especially one that is not serious
to fail or give up because of stress or tension