K-3：keep one's feet 不摔倒
A:Have you finally learned to skate?
A:你学会滑冰了吗？
B:No. It was very hard for me to keep my feet on the ice.
B：没有，我很难在冰上站稳。
A:Don't lose heart. You'll succeed in the end.
A:不要丧失信心，你最终会学会的。
B:I hope so.
B：但愿吧！
