first

num.第一 a.最初的 n.最初；(pl.)一级品?

firebrand, firecracker, firedamp (also damp), firedog, firefly, firelight, fireman, firemen, fireplace, fireproof, fireside, firewood, firework, firing, firing-line, firing-squad, firm, firmament, firmly, firmness, 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 of all, first offender, first officer, first or last, first refusal, first school, first-aid,