I kept the birds indoors all winter and introduced them into an aviary the following June...整个冬天我把鸟关在室内,然后在接下来的6月份把它们放入鸟类饲养场饲养。Since she was indoors, she had not been wearing a coat...由于她在室内,就没有穿外套。Everyone was indoors o...
肺细胞约每周新老更替一次。Lung cells die and are replaced about once a week.昼夜更替.Day and night alternate.从事高等教育的人员新老更替极其缓慢。There has been very little renewal of personnel in higher education....