zhēng / qì / xì / tǒngg / zhōng / de / qì / fá / xū / yào / dìng / qī / jiǎn / chá / yǐ / fáng / zhǐ / xiè / lòu蒸汽系统中的汽阀需要定期检查以防止泄漏The steam valve in a steam system needs regular inspection to prevent leakage.