She said the system will be programmed to react to the user’s progress. If they fall behind on their goals, more motivation will be sent.

{7}她说，经编程设计，系统将会根据使用者的进度作出反应，如果他们没有实现目标，系统将会发出更多的鼓励。

youdao

Dr.Rwagacondo says if children get sick, they don't go to school and fall behind scholastically.

VOA: standard.2009.04.25

Would the winner of the war slaughter the enemy that would fall behind or would they give them back?

战争胜利的一方会屠杀对方落在后面的人,还是任其溃逃

耶鲁公开课 - 古希腊历史简介课程节选

The longer these students stay in special language programs, the further they fall behind in other subjects.

NPR: Instruction Of Students Learning English Bleak

They fall behind by an average of over two months in their reading.

ECONOMIST: Children are exceptions to the country��s work ethic

As Americans stay unemployed for long stretches, they fall behind on card payments, get written off and have no access to new credit.

WSJ: Long-Term Unemployed Fall Out of Credit-Card Statistics