要使你的房子里没有小老鼠，用圆珠笔来检查下所有的小洞。如果圆珠笔能放进去的话，那小老鼠就可能钻进去。
To keep your house mouseproof , check all small openings with a ballpoint pen. If it fits the hole, it will let mice in.
他试着爬上梯子想从窗户钻进去。
He tried to climb up a ladder to get into his house through a window.
钻进去，几个月，一年两年，三年五年，总可以学会的。
If we dig into a subject for several months, for a year or two, for three or five years, we shall eventually master it.
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