Celta esol

hello i need help on the pre interview task is anyone can explain to me? i need help on the vocabulary question like think of the most efficient way of teaching Bicycle, behind

[Soup]

Hint: If you're in a foreign country and don't know the language, and you're in a situation where getting a bicycle could be the difference between life and death, how would you explain "bicycle" to the people around you? Same holds true for seemingly abstact concepts such as "behind".