English Slang Collection：
Einstein
[释] really really smart guy;
[例] That guy got an A in Algorithms with prof. Brady! What an Einstein!;
elbow grease
[释] working hard by putting all efforts into the job;
[例] The stain will come off eventually. It just takes some elbow grease.
empty nester
[释] a parent whose children have grown up and left home;
[例] You'll be an empty nester soon after your daughter goes to college.;
epic
[释] impressive, wonderful or awesome;
[例] The movie last night was epic and definitely worth watching.
epic fail
[释] when something is seen to be a total failure;
[例] I was denied to enter the examination hall for no ID card. What a epic fail.;
every cloud has a sliver lining
[释] for every bad thing that happens, there's something positive about it.