1.  fall behind
2.  drop out
3.  drop off
4.  lag behind

• 1. 掉队: fall out | fall behind | lag behind | fall behellond
• 2. 不让一个孩子掉队: No Child Left Behind | NCLB | No One Left
• 3. 不让一个孩子掉队法: No Child Left Behind Act | NCLB

更多释义

• 1.他的一个六年级学生是一个新移民，这名学生抵制他老师付出的最大努力，逐渐掉队。
  One of his sixth-grade students, a recent immigrant, was gradually falling behind, resisting his teacher's best efforts.
  dict.yoduao.com
• 2.两名掉队者落后了20码。
  There were two stragglers twenty yards back.
  dict.yoduao.com
• 3.你得努点儿力，才不会掉队。
  You will not be lagging behind if you work harder.
  dict.yoduao.com

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