They fall behind by an average of over two months in their reading.
他们落后平均超过两个月的阅读量。
They may fall far behind in their schoolwork and even develop behavior problems.
他们的功课会远远落后，甚至会引发行为上的毛病。
They never fall behind by simply standing still.
他们永远不会因为停滞不前而落后。
If a line begins to fall behind, they can always increase accuracy and reduce spread.
比如在准星后面增加一条延长线，可以很大程度上提高精度降低散布。
Now they no longer fall behind the others in meeting their quotas.
现在他们在完成定额方面不再落在别人后面了。
Now they no longer fall behind the others in meeting their quotas.
现在他们在完成定额方面不再落在别人后面了。
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