The journey to the airport takes about half an hour.
到機場大約需要半小時。
After half an hour, the fish stopped biting and we moved on.
過了半小時，魚不再上鉤，我們就走開了。
I could stuff myself with ten chocolate bars and half an hour later eat a big meal.
我可以給自己塞下10塊巧克力，并在半小時后再大吃一頓。