Locusts are normally solitary creatures, 蝗虫通常独居

111. has received its highest rainfall in years.
     迎来了近几年最大的降雨
112. Now, an army is on the march,
     蝗虫大军正大步行进
113. attracted by the smell of newly sprouting grass.
     追寻着新生嫩芽的香气
114. Locusts are normally solitary creatures,
     蝗虫通常独居
115. but when food becomes suddenly plentiful
     但当食物突然充足之时
116. they come together into an unstoppable force
     它们便聚集成群 以势不可挡的气势
117. that devours everything in its path.
     吞噬沿途所有的植物

来自《行星地球 第二季 第四集 Planet Earth S02E04 沙漠》第 114 行