What's the airing date of Armed Reaction 陀槍師姐 with 20 episodes in the Modern Action genre having an official website?
CREATE TABLE "second_line_series" (
  "airing_date" text,
  "english_title_chinese_title" text,
  "number_of_episodes" real,
  "genre" text,
  "official_website" text
);
SELECT "airing_date" FROM "second_line_series" WHERE "official_website"='official website' AND "number_of_episodes"=20 AND "genre"='modern action' AND "english_title_chinese_title"='armed reaction 陀槍師姐';