惯例: convention, usual practice...
敬而远之: to show respect from a distance (idiom), to remain at a respectful distance...
开机: to start an engine, to boot up (a computer), to press Ctrl-Alt-Delete, to begin shooting a film or TV show...
体操: gymnastic, gymnastics...
回首: to turn around, to look back, to recollect...
针锋相对: to oppose each other with equal harshness (idiom); tit for tat, measure for measure...
清明节: Qingming or Pure Brightness Festival or Tomb Sweeping Day, celebration for the dead (in early April)...