Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
nickname - n. a name that is different from your real name but is what your family and friends call you when they are talking to you or about you
vigorous - adj. done with great force and energy
strenuous - adj. requiring or showing great energy and effort
grief - n. deep sadness caused especially by someone's death
landslide - n. an election in which the winner gets a much greater number of votes than the loser
obligation - n. something that you must do because of a law, rule, promise, etc.
in his own right - n. because of his own efforts, talent, etc., and not because of his connection with someone else
lesson - n. something learned through experience
