短語詞組短語keep in constant touch 常川往來keep in constant 保持常量;保持在恒定;隨時保持Keep a constant speed 保持恒速不變Please keep in constant contact 請隨時保持聯(lián)系keep the vacuum constant 保持真空度不變keep constant tperature container 保煖集裝箱keep the pressure constant 保持恒壓KEEP CONSTANT TEMPERATURE CONTAINER 保溫集裝箱Keep constant over a decade 十年如一日 返回 keep constant