求翻译：四、光触媒:光触媒可轻易分解霉菌,解决物体发霉的问题。同时可强力分解臭源,加快有机物质、有毒气体的分解,提高空气净化效率。甲醛、乙醛、甲酸、苯酚、尼古丁等是空气中异臭味的主要来源,光触媒能较好地分解此类有机物。光触媒多需要在专业养护店内施工,一般价格在300-500元。是什么意思？

Four, Photocatalyst: Photocatalyst can easily decompose mold, mildew problems resolve objects. At the same time powerful decomposition odor source to speed up the decomposition of organic substances, toxic gases, improve the efficiency of air purification. Formaldehyde, acetaldehyde, nicotine, formic acid and phenol is a major source of abnormal odor in the air, photocatalyst to better process the compounds. Photocatalyst needs in the professional maintenance shop construction, general price at $ 300-500.