空中英語教室 Unless you're absolutely positive ...

PHOTOGRAPHY

隨走隨拍的7大訣竅　Tips for Getting the Most out of a “Photowalk”

探索新地方，拍出好照片

Explore a new place and take great photos

空中英語教室Good TV 網路收看

Grammar gym

Unless you're absolutely positive that you're going to be switching lenses during your walk, just bring a single lens.

Unless you're absolutely positive that you ..., just ...

example:

Unless you're absolutely positive that you want to go back to the hotel, just stay with the tour group and finish the tour.

Unless you're absolutely positive that you must finish your work today, just go ahead and take the rest of the day off.