1. The bench players are beginning to limber up on the sidelines to be ready to play in the game.2. You should limber up your whole body if you are about to do something intense for more than half an hour.
limber uplimber up = 做暖身運動，讓身體柔軟
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.