S-2：second to none 最佳的
A:You look blue today.
A:你今天看来不开心。
B:My son has caught a serious cold. I'm worried about him.
B:儿子的感冒还挺严重，我真担心他。
A:Why not try this medicine? It's second to none.
A:为什么不试试这种药？这是最好的。
B:Thanks a lot.
B:太谢谢了。
