特地查了SAG:
If you are a bicyclist, SAG stands for support and gear. During a race, a SAG vehicle will be a welcome sight as you fatigue or encounter mechanical complications with your bike. If you are not a cyclist, you can support the athletes by volunteering to be a SAG driver.
以后我先当SAG driver, 观摩一下哈LOL
WHAT IS A BONK?
As funny as it my sound, bonking is actually very serious and is what cyclists and other endurance sportspeople call hypoglycemia.
开始喜欢上骑车这项运动,先当个spectator