If you buy a ticket for the Taiwan High Speed Rail at the ticket counter, you are limited to a seat in the non-reserved car.
the non-reserved car on the Taiwan High Speed Rail高鐵自由座 = the non-reserved car on the Taiwan High Speed Rail高鐵 = the Taiwan High Speed Rail
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 o problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to rising sea levels.