2PREVENTa type of fence or gate that prevents people from moving in a particular direction 障碍物;栅栏;关卡
Crowds burst through the barriers and ran onto the pitch.
人群冲破围栏跑进球场。
3SEPARATEa physicalobject that keeps two areas, people etc apart 屏障
barrier between
The mountains form a natural barrier between the two countries.
群山构成了两国之间的天然屏障。
4the 10-second/40% etc barrierTMDSa level or amount of 10 seconds, 40% etc that is seen as a limit which it is difficult to get beyond 〔难以超越的〕10秒/40%等的关口
I’m hoping to crash the 20-second barrier in the final and get a bronze.