rat run-
He can see if it can regrow and the rat can still run around its cage .
他可以看到神经是否可以再生，而老鼠仍在笼子里四处跑。
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A rat was trained to run a maze .
训练一只老鼠去走迷宫。
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Everyone shouts " kill it " when a rat is seen to run across the street . He has crossed the border into another territory . Many steel arch bridges cross the Mississippi in its lower reaches . They have crossed over to Japan .
across是介词；cross是动词。他已越过边界进入别国的领土。在密西西比河的下游许多拱形铁桥横跨河面。他们已东渡去日本了。