first of all

首先，第一

firing-line, firing-squad, firm, firmament, firmly, firmness, first, first aid, first and foremost, first balcony, first base, first class, first cousin, first degree, first finger, first floor, first gear, first lady, first name, first night, first offender, first officer, first or last, first refusal, first school, first-aid, first-born, first-class, first-day cover, first-footing, first-fruit, first-hand, first-rate, firsthand, firstly, firth, fiscal, fiscal year, fish, fish and chips,