twocoreadj.双磁心的(双活性区的)twonum.二；两个two-cavity mould双型腔铸型two pairs of rules两双规则two-digit number两位数two-speed mixing双速搅拌two gene heterosis二基因杂种优势two-color ribbon双色色带two-rowed barley二棱小麦two-minute break两分钟休息two-pass channel双通道two-humped camel双峰驼