however在句子中通常作为转折副词使用，表示与前面的陈述相反的意思，常用于句中，也可用于句首或句尾。
例如：He is a great player. However, he cannot play well without his teammates.此外，和however相近的一个短语是on the other hand，也表示与前面的陈述相反的意思，但它通常用于句中或句首。
例如：She is not good at sports. On the other hand, she is very good at music.
