1、“落后”在英文中可以这么写:fall behind;lag behind; backward。
2、例句:
(1)“落在后面”: fall behind;lag behind
Be modest and prudent, never lag behind!谦虚谨慎, 永不落后!
Put on a spurt, or you'll fall behind。加把劲,不然你要落后了。
(2)“不先进”: backward
Put an end to the backwardness of the mountainous areas。改变山区落后面貌.