保护剂

保护剂	bǎo hù jì	protective agent
保	Bǎo	Bulgaria (abbr. for 保加利亚)
保	bǎo	to defend; to protect; to keep / to guarantee; to ensure / (old) civil administration unit in the baojia 保甲 system
保护	bǎo hù	to protect / to defend / to safeguard / protection / CL:种
护	hù	to protect
剂	jì	dose (medicine)