1. 不用说,参加面试时应该穿上正式的衣服。
Needless to say you should wear the formal dress when you're going to interview.
2. 不用说,空着肚子劳动是很难的。
Needless to say it is difficult to do work when you are hungry.
3. 不用说,启程旅行之前应该要先将车子加满油
Needless to say you should full up the petrol before starting our trip.