The squirrel got an A in climbing, but his flying teacher made him start from the ground up, instead of from the treetop down. His legs got so sore practicing takeoffs that he began getting Cs in climbing and Ds in running.
松鼠曾经在爬树课上得到了A，但是它的飞翔课老师要求它从地面往上飞，而不是从树顶往下飞。它的腿在练习地面起飞时拉伤了，所以在以后的爬树课上它只得到了一堆的C，在跑步课上，也只能得到一堆的D。