1·Modesty helps one go forward while pride makes one fall behind.
谦虚使人前进，骄傲让人落后。
2·Many Chinese mothers are afraid that their children will fall behind their classmates, so these mothers are becoming "tiger mothers".
许多中国妈妈担心自己的孩子会落后于同班同学，所以这些妈妈就变成了“虎妈”。
3·Put on a spurt, or you'll fall behind.
加把劲，不然你要落后了。
—— 《新英汉大辞典》
4·So why did we fall behind?
那么为什么我们落后了呢？
5·Often we waste our time through frivolous activities, and the poor management of our business makes us fall behind even without our noticing.
我们经常会把时间浪费在一些琐碎的事情上，在不知不觉中对事业的疏于管理使得我们落后于人。
1·If you stand still, you'll quickly fall behind.
如果你停滞不前，你很快就会掉队。
2·She urges parents to read to children from an early age so they do not fall behind in school.
她督促家长在孩子年幼时培养他们阅读，以便让他们在学校中不会掉队。
3·Boots of course would not fall behind, pulled the fur to do an ornament.
靴子当然不肯掉队，拉了皮毛来做点缀。
4·Try to catch up with him, or you will fall behind.
设法要赶上他，不然就会掉队。