长久: (for a) long time...
关掉: to switch off, to shut off...
词汇: vocabulary, list of words (e.g. for language teaching purposes), word...
开启: to open, to start, (computing) to enable...
是不是: is or isn't, yes or no, whether or not...
全国: whole nation, nationwide, countrywide, national...
绽放: to blossom...
轮廓: an outline, silhouette...
清明节: Qingming or Pure Brightness Festival or Tomb Sweeping Day, celebration for the dead (in early April)...
