巴士每三十分钟一班，每次浏览共需五十分钟。
Buses leave every thirty minutes and each tour takes a total of fifty minutes.
医生建议进行适当的锻炼，比如每周三次进行步行，每次步行三十分钟。
Physicians recommend moderate exercise like walking for thirty minutes, three times a week.
每次上课会先讲述课程约莫二十到三十分钟不等，且第一、二次上课讲述会更长。
Each session begins with a lecture of varying length, but usually running for twenty-minutes to half an hour, although the lectures of the first two meetings will be somewhat longer.
每次上课会先讲述课程约莫二十到三十分钟不等，且第一、二次上课讲述会更长。
Each session begins with a lecture of varying length, but usually running for twenty-minutes to half an hour, although the lectures of the first two meetings will be somewhat longer.
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