1. The duration of previous geologic periods was difficult to determine. 以前很难确定地质期的持续时间。
2. Recently, a zinc gel applied nasally has been shown to greatly reduce the duration of colds. 最近，一种应用于鼻腔的锌凝胶被证明可以大大缩短感冒的持续时间。
3. The length of time of which the eyes stop—the duration of the fixation—varies considerably from person to person. 眼睛停留的时间，即注视的持续时间，因人而异。
4. By contrast, the audience encounters an opera or a play over a specific time, which is the duration of the performance. 相反，观众可以有一段具体的时间来欣赏话剧或者戏剧，这段时间就是表演的持续时间。
5. The studies in which parents were asked about daycare and playgroup attendance varied when it came to the timing, duration. 在这些研究中，家长被问及日托和儿童游戏小组的出勤率，在时间、持续时间。
