Persimmons may be stored at room temperature 20 C where they will continue to ripen. In northern China, unripe persimmons are frozen outside during winter to speed up the ripening process.
unripeunripe = 還沒熟，常用在未熟的水果< >
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhous effect, which leads to melting of glaciers, which leads to rising sea levels.