to shake because of fear or anxiety
vor Angst zittern (vor Angst zittern)
"He trembled with fear when he saw the police car stop near him."
"Er zitterte vor Angst, als er das Polizeiauto in seiner Nähe anhalten sah." (Er **zitterte vor Angst**, als er das Polizeiauto in seiner Nähe anhalten sah.)
to pay attention so that you can hear a specific sound or wo...
to watch someone closely to ensure they do something correct...
to use knowledge or skills in a real situation
to establish or strengthen relationships with another countr...
to become very anxious or upset about something
to grow a concept so it works in many countries