1. This football game is a nail biter. It is exciting because we do not know how it will end.2. The basketball game between Lakers and Warriors was a cliffhanger which kept everyone on their toes. The score was tied 55-55.
 cliffhanger nail biter seesaw battle/game這些詞都指不到最後不知道結局的比賽，最常用的就是 cliffhanger 跟 nail biter。seesaw battle = 一來一往或你來我往的戰爭seesaw game = 一來一往或你來我往的比賽
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 greenhouse ffect, which leads to melting of glaciers, which leads to rising sea levels.