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。
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。
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。
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