[建] constancy of temperature
huì róng wēn dù héng dìng qíng kuàng ㄏㄨㄟˋ ㄖㄨㄥˊ ㄨㄣ ㄉㄨˋ ㄏㄥˊ ㄉㄧㄥˋ ㄑㄧㄥˊ ㄎㄨㄤˋ