Definition: more important, bigger or more serious than others of the same type Level: B2
这对该地区的居民来说是一个重大挑战。
This represents a ___major challenge for residents of this region.
糖是蛀牙的一个主要因素。
Sugar is a ___major factor in tooth decay.
美国在和平进程中发挥了重要作用。
The US has played a ___major role in the peace process.
