first aid

treatment given to an injured person before a doctor comes 急救.

firecracker, firedamp (also damp), firedog, firefly, firelight, fireman, firemen, fireplace, fireproof, fireside, firewood, firework, firing, firing-line, firing-squad, firm, firmament, firmly, firmness, first, 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, first-born,